#include<stdio.h>
int sumRecursive(int n)
{
if(n!= 0)
return n+sumRecursive(n - 1);
return 0;
}
int sumIterative(int n)
{
int i,sum=0;
for(i=0;i<=n;i++)
sum+=i;
return sum;
}
int main()
{
int n;
printf("Enter an integer between 1 and 1000: ");
scanf("%d",&n);
if(n>0 && n<=1000)
{
printf("Recursive sum = %d\n",sumRecursive(n));
printf("Iterative sum = %d\n",sumIterative(n));
}
else
printf("Invalid input\n");
}