Program To check a Number is Pallindrome & Armstrong

Some Basic C program frequently asked in Interview.

/*To check a number is pallindrome or not */

#include<stdio.h>

#include<conio.h>

void main()

{

int a,b,c,s=0;

clrscr();

printf("Enter a number:\t");

scanf("%d",&a);

c=a;

//the number is reversed inside the while loop.

while(a>0)

{

b=a%10;

s=(s*10)+b;

a=a/10;

}

//Here the reversed number is compared with the given number.

if(s==c)

{

printf("The no. %d is a pallindrome",c);

}

else

printf("The no. %d is not a pallindrome",c);

getch();

}

/*To check a number is armstrong or not */

#include<stdio.h>

#include<conio.h>

void main()

{

int a,b,c,s=0;

clrscr();

printf("Enter a number:\t");

scanf("%d",&a);

c=a;

//Sum of cube of each digit of given  number is claculated inside the while loop.

while(a>0)

{

b=a%10;

s=s+b*b*b;

a=a/10;

}

//Sum is compared with the given number.

if(s==c)

{

printf("The no. %d is a armstrong no.",c);

}

else

printf("The no. %d is not a armstrong no.",c);

getch();

}