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Thanlk u all.....

Actually I was trying to find out what does it return when I dont specify what to return.
I expected garbage but it gave the correct answer(in gcc, ubuntu. I am not much concerned about the...

#include<stdio.h>
int calsum(int x,int y,int z);
void main()
{
int a,b,c,sum;
printf("\nENter any three numbers\n");
scanf("%d\n%d\n%d",&a,&b,&c) ;
sum=calsum(a,b,c);
...