Series : 1 + 2 + 3 + 4 + 5 +...

/*
Write a program to display and find out the sum of series
Series : 1 + 2 + 3 + 4 + 5 +.......
*/
#include<stdio.h>

int series(int n);
int rseries(int n);

main()
{
 int n;
 printf("Enter number of terms : ");
 scanf("%d", &n);
 printf("\b\b = %d\n", series(n)); /* \b to erase last +sign */
 printf("\b\b = %d\n\n\n", rseries(n));
}

/*Iterative function*/
int series(int n)
{
 int i, sum=0;
 for(i=1; i<=n; i++)
 {
 printf("%d + ", i);
 sum+=i;
 }
return sum;
}

/*Recursive function*/
int rseries(int n)
{
 int sum;
 if(n == 0)
 return 0;
 sum = (n + rseries(n-1));
 printf("%d + ",n);
 return sum;
}