SUM OF DIGITS UNTIL IT CHANGES TO A SINGLE NUMBER

Consider the following I/O samples.

SAMPLE INPUT : 9863 == 9+8+6+3=26 == 2+6=8

SAMPLE OUTPUT:  8

C PROGRAM:

#include <stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    if(n%9 == 0)
        printf("9");
    else
        printf("%d",n%9);
    return 0;
}

 

OUTPUT:

 

  

The given source code in C program is short and simple to understand. The source code is well tested in DEV-C++ and is completely error free. 
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