09 Sum Of given number using loop.c

/* Sum Of given number using loop 

code by shivendra k jha 

*/

int sum(int n)
{
 if(n==0)
 return 0;
 return sum(n-1)+n;
}
int Isum(int n)
{
 int s=0,i;
 for(i=1;i<=n;i++)
 s=s+i;

 return s;
}
int main()
{
 int r=sum(5);
 printf("%d ",r);
 return 0;
}