Tổng hợp bài tập và bài giải C/C++ (P2)

1:SẮP XẾP MẢNG

#include<alloc.h>

#include<stdio.h>

#include<conio.h>

//=======================================

void taolap(int *A,int n)

{

int i;

printf("\n Tao lap day so:\n");

for(i=0;i<n;i++)

{

printf("\n A[%d]=",i);

scanf("%d",&A[i]);

}

void dayso(int *A,int n)

{

int i;

for(i=0;i<n;i++)

printf("%5d",A[i]);

}

void select(int *A,int n)

{

int i,j,temp;

for(i=0;i<n-1;i++)

{

for(j=i+1;j<n;j++)

{

if(A[i]>A[j])

{

temp=A[i];

A[i]=A[j];

A[j]=temp;

}

printf("\n Ket qua thu duoc la:");

dayso(A,n);

}

void luachon()

{

clrscr();

int *A,n;

printf("\n \t SAP XEP KIEU LUA CHON\n");

printf("\n Nhap so phan tu n=");

scanf("%d",&n);

A=(int*)malloc(n*sizeof(int));

taolap(A,n);

select(A,n);

free(A);

getch();

}

//=======================================

void in2(int *A,int n)

{

int i;

for(i=0;i<n;i++)

printf("%5d",A[i]);

}

void tructiep()

{

clrscr();

int *A,i,j,n,temp;

printf("\n SAP XEP KIEU TRUC TIEP\n");

printf("\n\t SAP XEP KIEU TRUC TIEP\n");

printf("\n Nhap so phan tu n=");

scanf("%d",&n);

A=(int*)malloc(n*sizeof(int));

printf("\n Tao lap day so:\n");

for(i=0;i<n;i++)

{

printf("\n A[%d]=",i);

scanf("%d",&A[i]);

}

for(i=1;i<n;i++)

{

temp=A[i];

for(j=i-1;j>=0&&temp<A[j];j--)

A[j+1]=A[j];

A[j+1]=temp;

printf("\n\nKet qua lan thu %d:",i);

in2(A,i+1);

}

free(A);

getch();

}

//=======================================

void tlap(int *A,int n)

{

int i;

printf("\n");

printf("\n Tao lap day so:\n");

for(i=0;i<n;i++)

{

printf("\n A[%d]=",i);

scanf("%d",&A[i]);

}

void in1(int *A,int n)

{

int i;

for(i=0;i<n;i++)

printf("%5d",A[i]);

}

void bubble(int *A,int n)

{

int i,j,temp;

for(i=1;i<n;i++)

{

for(j=n-1;j>=i;j--)

{

if(A[j-1]>A[j])

{

temp=A[j-1];

A[j-1]=A[j];

A[j]=temp;

}

printf("\n\n Ket qua lan %d:",i);

in1(A,n);

}

void suibot()

{

clrscr();

int *A,n;

printf("\n SAP XEP KIEU SUI BOT\n");

printf("\n Nhap so phan tu n=");

scanf("%d",&n);

A=(int*)malloc(n*sizeof(int));

tlap(A,n);

bubble(A,n) ;

free(A);

getch();

}

//=======================================

void qs(int *A,int left,int right)

{

int i,j,x,y;

i=left;

j=right;

x=A[(left+right)/2];

{

while(A[i]<x&&i<right)i++;

while(A[j]>x&&j>left)j--;

if(i<=j)

{

y=A[i];

A[i]=A[j];

A[j]=y;

i++;

j--;

}

}while(i<=j);

if(left<j)qs(A,left,j);

if(i<right)qs(A,i,right);

}

void quick(int *A,int n)

{

qs(A,0,n-1);

}

void in3(int *A,int n)

{

int i;

for(i=0;i<n;i++)

printf("%5d ",A[i]);

}

void nhanh()

{

clrscr();

int *A,n;

printf("\n SAP XAP NHANH\n");

printf("\n So phan tu n=");

scanf("%d",&n);

A=(int*)malloc(n*sizeof(int));

printf("\n\n Tao lap day so:\n");

for(int i=0;i<n;i++)

{

printf("\n A[%d]=",i);

scanf("%d",&A[i]);

}

quick(A,n);

printf("\n\n");

printf("Ket qua thu duoc la:\n\n");

in3(A,n);

getch();

free(A);

}

//=======================================

void in4(int *A,int n)

{

for(int i=0;i<n;i++)

printf("%5d",A[i]);

}

void merge(int *A,int n)

{

int i,k,j,low1,up1,low2,up2,size;

int *ds;

size=1;

ds=(int*)malloc(n*sizeof(int));

while(size<n)

{

low1=0;

k=0 ;

while(low1+size<n)

{

low2=low1+size;

up1=low2-1;

if(low2+size-1<n)

up2=low2+size-1;

else

up2=n-1;

for(i=low1,j=low2;i<=up1 && j<=up2;k++)

{

if(A[i]<=A[j])

ds[k]=A[i++];

else

ds[k]=A[j++];

}

for(;i<up1;k++)

ds[k]=A[i++];

for(;j<up2;k++)

ds[k]=A[j++];

low1=up2+1;

}

for(i=low1;k<n;i++)

ds[k++]=A[i];

for(i=0;i<n;i++)

A[i]=ds[i];

size*=2;

}

printf("\n \n Ket qua thu duoc la:\n\n");

in4(A,n);

free(ds);

}

void hoanhap()

{

clrscr();

int *A,n,i;

printf("\n \t SAP XEP KIEU HOA NHAP\n");

printf("\n So phan tu n=");

scanf("%d",&n);

A=(int*)malloc(n*sizeof(int));

printf("\n Tao lap day so:\n");

for(i=0;i<n;i++)

{

printf("\nA[%2d]=",i);

scanf("%d",&A[i]);

}

merge(A,n);

printf("\n");

getch();

free(A);

}

//=======================================

void in5(int *A,int n)

{

for(int i=0;i<n;i++)

printf("%5d",A[i]);

}

void shaker(int *A,int n)

{

int i,j,temp,tdoi;

{

tdoi=0;

for(i=n-1;i>0;i--)

{

if(A[i-1]>A[i])

{

temp=A[i-1];

A[i-1]=A[i];

A[i]=temp;

tdoi=1;

}

for(j=1;j<n;j++)

{

if(A[j-1]>A[j])

{

temp=A[j-1];

A[j-1]=A[j];

A[j]=temp;

tdoi=1;

}

}while(tdoi);

printf("\n\n Ket qua la :",tdoi);

in5(A,n);

}

void shaker()

{

clrscr();

int *A,n,i;

printf("\n \tSHAKER_SORT\n");

printf("\n So phan tu n=");

scanf("%d",&n);

A=(int*)malloc(n*sizeof(int));

printf("\n \n Tao lap day so:\n");

for(i=0;i<n;i++)

{

printf("\n A[%2d]=",i);

scanf("%d",&A[i]);

}

shaker(A,n);

getch();

free(A);

}

//=======================================

void main()

{

while(1) {

clrscr();

int key;

printf("\n\tSAP XEP VA TIM KIEM\n");

printf("\n 1.Selection_sort\n");;

printf("\n 2.Bubble_sort\n");

printf("\n 3.Insertion_sort\n");

printf("\n 4.Quick_sort\n");

printf("\n 5.Merge_sort\n");

printf("\n 6.Shaker_sort\n");

printf("\n 0.Tro ve");

printf("\nBam mot phim de chon chuc nang:");

scanf("%d",&key);

if(key==0) break;

switch(key)

{

case 1:

clrscr();

luachon();

printf("\n\n\tAn phim bat ky de tro lai menu chinh");

getch();

clrscr();

break;

case 2:

clrscr();

suibot();

printf("\n\n\tAn phim bat ky de tro lai menu chinh");

getch();

clrscr();

break;

case 3:

clrscr();

tructiep();

printf("\n");

printf("\nAn phim bat ky de tro lai menu chinh");

getch();

clrscr();

break;

case 4:

clrscr();

nhanh();

printf("\n");

printf("\nAn phim bat ky de tro lai menu chinh");

getch();

clrscr();

break;

case 5:

clrscr();

hoanhap();

printf("\n");

printf("\nAn phim bat ky de tro lai menu chinh");

getch();

clrscr();

break;

case 6:

clrscr();

shaker();

printf("\n");

printf("\nAn phim bat ky de tro lai menu chinh");

getch();

clrscr();

break;

}

// getch();

}

2:Một ví dụ về Đa hình

#include <iostream.h>
#include <conio.h>
#include <math.h>
class hinhve
{
   public:
       virtual float dientich() = 0;
        virtual char *ten() = 0;
        virtual void in()=0;
};

class haichieu : public hinhve
{
    public:
       virtual float chuvi() = 0;
      void in()
      {
           cout<<"ten cua hinh: "<<ten()
             <<" ,dien tich la: "<<dientich()
             <<" ,chu vi la: "<<chuvi()<<endl;
      }
};

class bachieu : public hinhve
{
  public:
      virtual float thetich() = 0;
      void in()
      {
           cout<<"ten cua hinh: "<<ten()
             <<" ,dien tich la: "<<dientich()
             <<" ,the tich la: "<<thetich()<<endl;
      }
};

class hinhtron : public haichieu
{
      private:
       float r;
   public:
       hinhtron() { r = 0;}
       hinhtron(float bk) {r = bk;}
      float chuvi()
      {
            return 2*3.14*r;
      }
      float dientich()
      {
             return 3.14*r*r;
      }
      char *ten()
      {
             return "Hinh Tron";
      }

};

class hinhvuong : public haichieu
{
      private:
       float a;
   public:
       hinhvuong(float x)
      {
               a = x;
      }
      float chuvi()
      {
          return a*4;
      }
      float dientich()
      {
              return a*a;
      }
      char *ten()
      {
             return "Hinh Vuong";
      }
};

class tgdeu : public haichieu
{
     private:
       float a;
   public:
       tgdeu(float x) : a(x){}
      float chuvi()
      {
              return 3*a;
      }
      float dientich()
      {
           return a*a*sqrt(3)/2;
      }
      char *ten()
      {
              return "Hinh tam giac deu";
      }
};
class cau: public bachieu
{
  private:
      float r;
   public:
      cau(float bk): r(bk){}
      float thetich() { return r*r*r*3.14;}
      float dientich() { return 4*3.14*r*r; }
      char *ten()
      {
           return "Hinh Cau";
      }
};

class lapphuong : public bachieu
{
      private:
       float a;
   public:
       lapphuong(float x) : a(x) {}
       float thetich() { return a*a*a; }
       float dientich() { return 6*a*a; }
       char * ten() { return "Hinh Lap Phuong"; }
};

void main()
{
   hinhve *p;
   p = new hinhtron(3);
   p->in();
   delete p;
   p = new lapphuong(3);
   p -> in();
   delete p;
   p = new cau(3);
   p -> in();
   delete p;
   p = new tgdeu(5);
   p -> in();
   delete p;
   p = new hinhvuong(6);
   p -> in();
   getch();
}

3:Tiếp một ví dụ về Đa hình

#include <iostream.h>
#include <conio.h>
#include <math.h>

class Point
{
      private:
       int x; int y;
   public:
       Point()
      {
            x = 0; y = 0;
      }
       Point(int a,int b)
      {
            x = a; y = b;
      }
      virtual void set(int a,int b)
      {
            x = a; y = b;
      }
      float gettung()
      {
            return y;
      }
      float gethoanh()
      {
            return x;
      }
      float kc(Point t)
      {
             return ((x - t.x)*(x - t.x) + (y - t.y)*(y - t.y));
      }
      virtual void in()
      {
            cout<<"\n("<<x<<";"<<y<<")";
      }
};
class Cpoint : protected Point
{
    private:
       int mau;
   public:
      Cpoint() : Point()
      {
             mau = 0;
      }
       Cpoint(int a,int b,int mau_) : Point(a,b)
      {
             mau = mau_;
      }
      void set(int a,int b,int mau_)
      {
            Point::set(a,b);
          mau = mau_;
      }
      void in()
      {
             Point::in();
               cout<<" Co mau la "<<mau;
      }
} ;

void main()
{
    Point *p;
   p = new Cpoint(3,5,6);
   p->in();
   delete p;
   p = new Point(5,2);
   p->in();
   getch();
}

4:Tổng hai ma trận

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
void congmt(float a[][10],float b[][10],float c[][10],int hang,int cot);
void nhapmt(float a[][10],int hang,int cot);
void inmt(float a[][10],int hang,int cot);
void main()
{
    system("color 3e");
    float a[10][10],b[10][10],c[10][10];
    int hang1,cot1;

   cout<<"Moi ban nhap vao ma tran a: \n";
   cout<<"Nhap vao so hang cua ma tran a: ";
   cin>>hang1;
   cout<<"Nhap vao so cot cua ma tran a: ";
   cin>>cot1;
   nhapmt(a,hang1,cot1);
   inmt(a,hang1,cot1);

   int hang2,cot2;
   cout<<"Moi ban nhap vao ma tran b: \n";
   do
   {
       cout<<"Nhap vao so hang cua ma tran b: ";
       cin>>hang2;
   }while(hang2 != hang1);
   do
   {
       cout<<"Nhap vao so cot cua ma tran b: ";
       cin>>cot2;
   }while(cot2 != cot1);
   nhapmt(b,hang2,cot2);
   inmt(b,hang2,cot2);

   cout<<"\nVay tong cua hai ma tran a,b la: \n";
   congmt(a,b,c,hang1,cot1);
   inmt(c,hang1,cot1);
   getch();
}

void congmt(float a[][10],float b[][10],float c[][10],int hang,int cot)
{
     for (int i=0; i<hang; i++)
        for (int j=0; j<cot; j++)
          c[i][j] = a[i][j] + b[i][j];
}

void nhapmt(float a[][10],int hang,int cot)
{
     for(int i = 0;i < hang;i++)
   {
       for(int j = 0; j < cot; j++)
      {
           cout<<"Nhap vao phan tu ["<<i<<";"<<j<<"]: ";
         cin>>a[i][j];
      }
   }
}

void inmt(float a[][10],int hang,int cot)
{
     for(int i = 0; i < hang; i++)
   {
        for(int j = 0; j < cot; j++)
      {
           cout<<a[i][j]<<"\t";
      }
      cout<<endl;
   }
}

5:Một ví dụ về sử dụng template và quá tải toán tử Nhập xuất

#include <iostream.h>
#include <stdlib.h>
#include <conio.h>
class sv
{
    private :
       char ten[100];
      float Diem;
   public:
       sv()
      {
          Diem=0;
      }
      sv(char a[],float D)
      {
            strcpy(ten,a);
         Diem=D;
      }
      sv(sv&a)
      {
          Diem = a.Diem;
              strcpy(ten,a.ten);
      }
      void set_sv(char a[],float D)
      {
            strcpy(ten,a);
         Diem=D;
      }
      float get_diem()const
      {
          return Diem;
      }
      char* get_ten()
      {
          return ten;
      }
      friend ostream&operator <<(ostream&out,sv&);
      friend istream&operator>>(istream&in,sv&);
      operator float()
      {
          return float(Diem);
      }

};
ostream&operator <<(ostream&out,sv&a)
{
     cout<<"\n\n\t\t\tTen "<<a.ten<<endl;
   cout<<"\t\t\tDiem "<<a.Diem<<endl;
}
istream&operator>>(istream&in,sv&a)
{
    cout<<"\t\t\tNhap ten ";
   cin.ignore();
   cin.getline(a.ten,50);
   cout<<"\t\t\tNhap diem ";
   cin>>a.Diem;

}
int ucln(int a,int b)
{
    int r;
   while(b)
   {
       r = a%b;
      a = b;
      b=r;
   }
   return a;
}

class phanso
{
    private:
       float tu,mau;
   public:
       phanso(float a=1,float b=1)
      {
          if(b)
         {
             tu = a;
            mau = b;
         }
         else
         {
             tu =1;
            mau=1;
         }
      }
      void set_phanso(float a,float b)
      {
          tu =a;
         mau = b;
      }
      void nhap()
      {
          cout<<"\t\t\tNhap du lieu cho phan so "<<endl;
         cout<<"\t\t\tTu ";
         cin>>tu;
         cout<<"\t\t\tMau ";
         cin>>mau;
         toigian();
      }
      void toigian()
      {
          int t=ucln(tu,mau);
         tu = tu/t;
         mau = mau/t;
      }
      operator float()
      {
          return float(tu/mau);
      }
        friend ostream&operator <<(ostream&out,phanso&a);
      friend istream&operator >>(istream&in,phanso&a);

};
ostream&operator<<(ostream&out,phanso&a)
{
    out<<a.tu<<"/"<<a.mau<<"->";
}
istream&operator >>(istream&in,phanso&a)
{
    cout<<"\t\tTu ";
   cin>>a.tu;
   cout<<"\t\tMau ";
   cin>>a.mau;
}
template <class T,int n>
class set
{
    private:
       T data[n];
      int spt;
   public:
       set()
      {
          spt=0;
      }
        set(const set&a)
      {
          for(int i=0;i<a.spt;i++)
             data[i]=a.data[i];
            spt = a.spt;
      }
      void them(T&a);
      bool search(T&a);
      friend ostream& operator<<(ostream&out,set<T,n>&a);
      friend set operator +(set&a,set&b);
      friend set operator *(set&a,set&b);
      friend set operator -(set&a,set&b);
      set operator =(const set&b)
      {
              for(int i=0;i<b.spt;i++)
                   data[i]=b.data[i];
              spt=b.spt;
            return (*this);
      }

};
template <class T,int n>
void set<T,n>::them(T&a)
{
    if(spt<n)
       data[spt++]=a;
   else
       cout<<"\t\tMang da day rui khong them duoc nua dau "<<endl;
}
template <class T,int n>
bool set<T,n>::search(T&a)
{
    for(int i=0;i<spt;i++)
       if(data[i]==a)
          return true;
        return false;
}
template <class T,int n>
ostream&operator<<(ostream&out,set<T,n>&a)
{
   if(a.spt==0)
       out<<" rong "<<endl;
    for(int i=0;i<a.spt;i++)
   {
       out<<a.data[i];
          if(i<a.spt-1)
          cout<<"->";
   }
}
template <class T,int n>
set<T,n> operator +(set<T,n>&a,set<T,n>&b)
{
    set<T,n> r(a);

     for(int i=0;i<b.spt;i++)
          if(!a.search(b.data[i]))
                r.them(b.data[i]);

   return r;
}
template <class T,int n>
set<T,n> operator -(set<T,n>&a,set<T,n>&b)
{
    set<T,n> r;
    for(int i=0;i<a.spt;i++)
       if(!b.search(a.data[i]))
          r.them(a.data[i]);
    return r;
}
template <class T,int n>
set<T,n> operator *(set<T,n>&a,set<T,n>&b)
{
    set<T,n> r;

    for(int i=0;i<a.spt;i++)
       if(b.search(a.data[i]))

          r.them(a.data[i]);

         return r;
}
void main()
{
      set<float,100> a;
   set<float,100> c;
   set<float,100> d;
   set<float,100> e;
   set<float,100> f;
   set<sv,100> g;
   set<phanso,100> b;
   int n,m,l;
   float r;
   sv A;
   phanso s;
   cout<<"\t\t\tNhap so luong cac so thu ";
   cin>>n;
   for(int i=0;i<n;i++)
   {
       cout<<" nhap so thu "<<(i+1)<<":";
      cin>>r;
      a.them(r);
   }clrscr();
   cout<<"\t\t\tNhap so luong phan so ";
   cin>>m;
   for(int i=0;i<m;i++)
   {
       cout<<"\t\t\tNhap phan so thu "<<(i+1)<<endl;
      cin>>s;
      b.them(s);
      c.them(s);clrscr();
   }

   clrscr();
   cout<<"\t\t\tNhap so luong cac sinh vien ";
   cin>>l;
   for(int i=0;i<l;i++)
    {
       cout<<"\t\t\tNhap du lieu cho sinh vien thu "<<(i+1)<<endl;
      cin>>A;
      g.them(A);
      clrscr();
   }
   clrscr();
   textcolor(YELLOW+RED);
   cprintf("%s","\t\t\tchuong trinh da gan cac so 1 cach tu dong ta duoc ");
   cout<<"\n\nday so thuc vua nhap  "<<endl;
   cout<<a;
   cout<<"\n\nday phan so vua nhap  "<<endl;
      cout<<b;
   cout<<"\n\tDay sinh vien vua nhap "<<endl;
   cout<<g;
   getch();clrscr();
   d = a+c;
   cout<<"\n\n hop cua hai tap hop phan so va so thuc  la "<<endl;;
   cout<<d;
   e=a*c;
   cout<<"\n\n giao cua hai tap so thuc va phan so  la "<<endl;
   cout<<e;
   cout<<"\n\nhieu cua hai tap so thuc va phan so la "<<endl;
   f=a-c;
   cout<<f;

    getch();
}

6:Ví dụ về quá tải toán tử

#include <iostream.h>
#include <conio.h>
#include <math.h>
class PS
{
    public:
        long tu,mau;

        PS()
        {
            tu=0;
            mau=0;
        }
        ~PS(){};
      int uscln(long a,long b);
      void rutgon();
      void nhap();
      void  xuat();
      PS operator+(PS &a);
      PS operator-(PS &a);
      PS operator*(PS &a);
      PS operator/(PS &a);

};
    int PS::uscln(long a,long b)
    {
        if(a!=0 && b!=0)
        {
            a=abs(a);
            b=abs(b);
            while(a!=b)
            {
                if(a>b)
                    a=a-b;
                else
                    b=b-a;
            }
            return a;
        }
        else
            return 1;
    }

   void PS::rutgon()
    {
        int u;
            u=uscln(tu,mau);
            tu=tu/u;
            mau=mau/u;
    }

    void PS::nhap()
    {
        Nhap:
        cout<<"Nhap tu so ";
        cin>>tu;
        cout<<"Nhap mau so ";
        cin>>mau;
        if(mau==0)
        {
            cout<<"Mau phai khac 0"<<endl;
            goto Nhap;
        }
    }

    void PS::xuat()
    {
            rutgon();
        if(mau<0)
        {mau=-mau; tu=-tu;}
        if(tu==0)
            cout<<"0"<<endl;
        else
            if(mau==1)
                cout<<tu<<endl;
            else
                cout<<tu<<"/"<<mau<<endl;
    }

    PS PS::operator+(PS &a)
    {
        a.tu=tu*a.mau+mau*a.tu;
        a.mau=mau*a.mau;
        return a;
    }
    PS PS::operator-(PS &a)
    {

        a.tu=tu*a.mau-mau*a.tu;
        a.mau=mau*a.mau;
        return a;
    }
    PS PS::operator*(PS &a)
    {
        a.tu=tu*a.tu;
        a.mau=mau*a.mau;
        return a;
    }
    PS PS::operator/(PS &a)
    {
        a.tu=tu*a.mau;
        a.mau=mau*a.tu;
        return a;
    }

7:Đếm số lần xuất hiện của các ký tự trong chuỗi

#include <stdio.h>

#include <ctype.h>

void main()

  char chuoi[80];

  int i = 0, count = 0;

  printf("\nNhap vao mot chuoi bat ky : ");

  gets(chuoi);

  while (chuoi[i] != 0)

    if (isalpha(chuoi[i++]))

      count++;

  printf("So ky tu trong chuoi = %d", count);

  getch();

8:Bài toán Ancarokhi

#include <stdio.h>

void main()

  int dai, rong;

  printf("\nBai toan Ancarokhi : Tim dien tich hinh chu nhat co chieu dai gap hai");

  printf("\nchieu rong va dien tich = chu vi");

  for (dai = 1; dai < 100; dai ++)

    for (rong=1; rong < 100; rong++)

      if (dai == 2 * rong && (dai + rong)*2 == dai*rong)

         printf("\nDai = %d; Rong = %d", dai, rong);

  getch();

9:Chứng minh đẳng thức An Casi

#include <stdio.h>

unsigned long vetrai(unsigned long n)

  unsigned long tmp=0, i;

  for (i=1; i<=n; i++)

    tmp += i*i*i*i;

  return tmp;

unsigned long vephai(unsigned long n)

  unsigned long tmp;

  tmp = (long)6*n*n*n*n*n + (long)15*n*n*n*n + (long)10*n*n*n - n;

  tmp = tmp / (long)30 ;

  return tmp;

void main()

  unsigned long tong1, tong2, n;

  for (n=1; n<=50; n++)

    tong1 = vetrai(n);

    tong2 = vephai(n);

    if (tong1 == tong2)

      printf("\nSo %d thoa man dang thuc An Casi. ", n);

      printf("Tong1 = %ld - Tong2 = %ld", tong1, tong2);

    else

      printf("\nSo %d khong thoa man dang thuc An Casi. ", n);

      printf("Tong1 = %ld - Tong2 = %ld", tong1, tong2);

  getch();

10:Hiện bảng mã ASCII

#include <stdio.h>

#include <conio.h>

void main()

  int i, j;

  clrscr();

  printf("    ");

  for (j=0; j<16; j++)

    printf("%3d", j);

  for (i=2; i<16; i++)

    for (j=0; j<16; j++)

       if (j == 0)

         printf("\n%2d  ", i);

       printf("  %c", i*16+j);

  getch();

11:In ra năm âm lịch tương ứng với năm nhập vào.

#include <stdio.h>

#include <conio.h>

void main()

  unsigned nam;

  char can[][5] = {"Giap", "At", "Binh", "Dinh", "Mau", "Ky",

                   "Canh", "Tan", "Nham", "Quy"};

  char chi[][5] = {"Ty", "Suu", "Dan", "Meo", "Thin", "Ty",

                   "Ngo", "Mao", "Than", "Dau", "Tuat", "Hoi"};

  printf("\nNhap nam can biet : ");

  scanf("%d", &nam);

  printf("Nam am lich cua %d la %s %s", nam, can[(nam+6)%10], chi[(nam+8)%12]);

  getch();

12:In ra bảng cửu chương

#include <stdio.h>

#include <conio.h>

#include <string.h>

void main()

  int i, j;

  char chuoi[] = "B A N G   C U U   C H U O N G";

  char ten[10][5] = {"","","Hai", "Ba", "Bon", "Nam",

                     "Sau", "Bay", "Tam", "Chin"};

  clrscr();

  textcolor(YELLOW);

  gotoxy((80 - strlen(chuoi)) / 2, 1);

  cprintf("%s\n\n", chuoi);

  for (i=2; i<=9; i++)

    gotoxy(10*(i-2) + (10 - strlen(ten[i]))/2, 4);

    textcolor(i);

    cprintf("%s", ten[i]);

  for (j=1; j<=10; j++)

    for (i=2; i<=9; i++)

      gotoxy(10*(i-2) + 1, j+4);

      textcolor(i);

      cprintf("%dx%2d = %2d", i, j, i*j);

  getch();

13:Nhập chuỗi và in chuỗi

#include <stdio.h>

#include <conio.h>

void main()

   char name[80];

   printf("\nXin cho biet ten cua ban : ");

   gets(name);

   printf("Chao %s\n", name);

   getch();

14:Giải hệ phương trình bậc nhất.

#include <stdio.h>

#include <conio.h>

void main()

  int a, b, c, d, e, f, dthuc;

  float x, y;

  printf("\nNhap vao cac he so a,b,c,d,e,f : ");

  scanf("%d%d%d%d%d%d", &a, &b, &c, &d, &e, &f);

  dthuc = b*d - e*a;

  if (dthuc != 0)

    y = (float)(c*d-a*f)/dthuc;

    x = (float)(b*f-c*e)/dthuc;

    printf("Nghiem x = %f, y = %f", x, y);

  else

    printf("\nHe phuong trinh vo ngiem.");

  getch();

15:Tính thứ của ngày

#include <stdio.h>

#include <conio.h>

struct date

   int     month;

   int    day;

   int    year;

} date_1;

long int funct1 (int y,int m)

  long int result;

     if ( m <= 2 )

       y -= 1;

     result = y;

     return (result);

long int funct2 (int m)

     long int result;

     if ( m <= 2 )

       result = m + 13;

     else

       result = m + 1;

       return(result);

long int day_count (int m, int d, int y)

     long int number;

     number = 1461 *  funct1(y,m) / 4 + 153 * funct2(m) / 5 + d;

     return (number);

void main ()

    long int number_of_days1;

    int day_of_week;

    printf ("Nhap vao mot ngay (dd mm yyyy), vd  12 03 1999  \n");

    scanf ("%d %d %d", &date_1.day, &date_1.month, &date_1.year);

    number_of_days1 = day_count (date_1.month, date_1.day, date_1.year);

    printf ("\nNgay la : " );

    day_of_week = (number_of_days1 - 621049) % 7;

    switch (day_of_week)

        case 0 :

            printf ("Chu Nhat,");

            break;

        case 1 :

            printf ("Thu Hai,");

            break;

        case 2 :

            printf ("Thu Ba,");

            break;

        case 3 :

            printf ("Thu Tu,");

            break;

        case 4 :

            printf ("Thu Nam,");

            break;

        case 5 :

            printf ("Thu Sau,");

            break;

        case 6 :

            printf ("Thu Bay,");

            break;

  getch();

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