Source Code:
#include<stdio.h>
int sum(int);
int main()
{
int n,result;
//variable declaration
printf("\nEnter the value of N: ");
scanf("%d",&n);
//takes input
result=sum(n); //call
recursive function
printf("sum of 1 to %d is %d\n",n,result);
//print result
return 0;
}
//Resursive function
int sum(int n)
{
/* In every recursive call value of n is decremented
by 1
and when the value of n becomes 1
it returns 1 */
if(n==1)
{
return 1;
}
else
{
return n+sum(n-1);
}
}
Output:
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