Sample C++ Programs

1) write a program to find the area of a Triangle.

#include<iostream>

using namespace std;

int main()

{

int area,base,height;

cout<<"Enter the base and height";

cin>>base>>height;

area=0.5*base*height;

cout<<"Area= "<<area;

}

2)Write a program to reverse a three digit number

#include<iostream>

using namespace std;

int main()

{

int n,rem,s=0;

cout<<"Enter a three digit number";

cin>>n;

while(n>0)

{

rem=n%10;

s=s*10+rem;

n=n/10;

}

cout<<s;

return 0;

}

3)Write a program to find the smallest of three numbers

#include<iostream>

using namespace std;

int main()

{

int a,b,c;

cout<<"Enter three numbers";

cin>>a>>b>>c;

if(a<b)

{

if(a<c)

cout<<" a is small";

else

cout<<"c is small";

}

else

{

if(b<c)

cout<<"b is small";

else

cout<<"c is small";

}

}

4)    Write a program to find if a number is prime or not

#include<iostream>

using namespace std;

int main()

{

int num,flag=0,i;

cout<<"Enter a Number";

cin>>num;

for(i=2;i<num;i++)

{

if(num%i==0)

{

flag=1;

break;

}

}

if(flag==0)

cout<<"Number is Prime";

else

cout<<"Number is Not Prime";

}

5)Write a program to check if a number is Even or Odd

#include<iostream>

using namespace std;

int main()

{

int n,rem;

cout<<"Enter a number";

cin>>n;

rem=n%2;

if(rem==0)

{

cout<<"Even";

}

else

{

cout<<"Odd";

}

}

6)Write a program to print a day of week

#include<iostream>

using namespace std;

int main()

{

int day;

cout<<"Enter the day of week";

cin>>day;

switch (day)

{

case 1:cout<<"Sunday";break;

case 2:cout<<"Monday";break;

case 3:cout<<"Tuesday";break;

case 4:cout<<"Wednesday";break;

case 5:cout<<"Thursday";break;

case 6:cout<<"Friday";break;

case 7:cout<<"Saturday";break;

default :cout<<"Invalid Input";

}

}

7)Write a program to find the Factorial of a givenumber.(Example 3 factorial=1*2*3 ie,6)

#include<iostream>

using namespace std;

int main()

{

int n,i,fact=1;

cout<<"Enter a number";

cin>>n;

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

{

fact=fact*i;

}

cout<<"Fatorial ="<<fact;

}

8)Write a program to find the sum of the digits of a threedigit number

#include<iostream>

using namespace std;

int main()

{

int n,rem,s=0,i;

cout<<"Enter a three digit number";

cin>>n;

for(i=0;i<3;i++)

{

rem=n%10;

s=s+rem;

n=n/10;

}

cout<<"Sum of digits="<<s;

}

9)Write a program to print the pattern

1

2 2

3 3 3

4 4 4 4 4

5 5 5 5 5 5

#include<iostream>

using namespace std;

int main()

{

int i,j;

for(i=1;i<=5;i++)

{

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

{

cout<<"\t"<<i;

}

cout<<"\n";

}

}

10)Write a program to print the pattern

A

B B

C C C

D D D D

E E E E E

#include<iostream>

using namespace std;

int main()

{

int i,j;

char ch=65;

for(i=1;i<=5;i++)

{

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

{

cout<<"\t"<<ch;

}

cout<<"\n";

ch=ch+1;

}

}

11)Write a program to print

*

* *

* * *

* * * *

* * * * *

#include<iostream>

using namespace std;

int main()

{

int i,j;

for(i=1;i<=5;i++)

{

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

{

cout<<"\t"<<"*";

}

cout<<"\n";

}

}

12) Write a program to produce the following outputusing nested loop

A

AB

ABC

ABCD

ABCDE

#include<iostream>

using namespace std;

int main()

{

int i,j;

for(i=1;i<=5;i++)

{

char ch=65;

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

{

cout<<"\t"<<ch;

}

cout<<"\n";

ch=ch+1;

}

}

13.Write a program to find the sum of first n naturalnumbers

#include<iostream>

using namespace std;

int main()

{

int n,s=0,i;

cout<<"enter a value";

cin>>n;

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

{

s=s+i;

}

cout<<"Sum ="<<s;

}

14.Write a program to print the Multiplication table of agiven number

#include<iostream>

using namespace std;

int main()

{

int n,i;

cout<<"enter a value";

cin>>n;

for(i=1;i<=10;i++)

{

cout<<n<<"*"<<i<<"="<<n*i;

cout<<"\n";

}

}