c - for loop not incrementing counter in gcc -

i'm using gcc 4.9.2 , have program print sum of 4th powers of n numbers.

i have written program sum printed out 4th power of number entered , not sum. think problem counter don't know what.

if(n>0 && n<=40) {    for(c=0;c<=n;c++)    {        s=0;        s=s+c*c*c*c;    }    printf("%d",s); }

because set

s=0;

inside loop.

put outside loop.

if(n>0 && n<=40) {    s=0;    for(c=0;c<=n;c++)    {        s=s+c*c*c*c;    }    printf("%d",s); }

btw: for-loop can changed to:

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

because value c=0 doesn't change anything.

Overvie