adding

 1. Program to find the sum of the last and first digits of given number.

#include<stdio.h>
int main()
{
    int n,b,sum,lastn,firstn;
    printf("enter numbers: ");
    scanf("%d",&n);
        lastn=n%10;
    while(n>=10)
    n=n/10;
    printf("last number=%d\nfirst number=%d",lastn,n );
    sum=lastn+n;
    printf("\nsum=%d+%d=%d",lastn,n,sum);
    return 0;
}

OUTPUT :

enter numbers: 7659
last number=9
first number=7
sum=9+7=16