Number Perfect or Not

Wap to check a number whether it is a perfect number or not

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int n,sum=0,i=1;

cout<<"enter no.";

cin>>n;

while(i<n)

{

if(n%i==0)

sum+=i;

i++;

}

if(sum==n)

cout<<"perfect";

else

cout<<"not perfect";

getch();

}

*****************

OUTPUT

enter no. 4

perfect

*****************

Sum of Digits

Wap to get the sum of the digits of a number.

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int n,sum=0,r;

cout<<"\n enter no.";

cin>>n;

for(;num!=0;)

{

r=n%10;

n/=10;

sum+=r;

}

cout<<sum;

getch();

}

***************

OUTPUT:

enter no. 234

9

***************

Shift Operator Divide Integer

Wap to use shift operator to divide an integer by 2.


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

void main()

{

clrscr();

int a;

cout<<"enter a;

cin>>a;

cout<<(a<<1);

getch();

}

**************

OUTPUT:

enter a 14

28

**************

Even Odd - Ternary Operator

Wap to check whether a number is even or odd using ternary operator .


#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int a;

cout<<"enter a";

cin>>a;

{

a%2==0?cout<<"even":cout<<"odd";

{

getch();

}

*************

OUTPUT:

enter a 42

even

*************

Print Number Pattern

Wap to print the following pattern :

      1

      1  3  

      1  3  5 

      1  3  5  7

      1  3  5  7  9

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int i,j;

for(i=0;i<=10;i+=2)

{

cout<<"\n";

for(j=1;j<=i;j+=2)

{

cout<<j;

}

getch();

}

*****************************

OUTPUT:

      1

      1  3  

      1  3  5 

      1  3  5  7

      1  3  5  7  9

*****************************

Factorial of Number

Wap to print factorial of a number


#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int n,i,fact=1;

cout<<"enter number";

cin>>n;

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

{

fact*=i;

}

cout<<"factorial is"<<fact;

getch();

}

******************

OUTPUT:

enter number 5

factorial is 120

******************

Sum of Natural Numbers

Wap to print the sum of first n natural numbers.

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int i,sum=0,n;

cout<<"no. of natural numbers";

cin>>n;

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

{

cout<<"\n"<<i;

sum+=i;

}

cout<<"\n"<<" sum of first"<<n<<"natural number is"<<sum<<"\n";

getch();

}

****************************

OUTPUT:

no. of natural numbers 5

1

2

3

4

5

sum of first 5 natural number is 15

****************************