/*WAP in C to print the following series and its sum*/
//Print Series & Sum: '1+2+4+7+11+....n = sum'

#include<stdio.h>
int main ()
{
	int n, i, k=0, sum=0;
	printf ("\nEnter the limit of the series: ");
	scanf ("%d", &n); 
	for (i=1; i<n; i+=k) //calculates sum till last second digit
	{
		sum = sum +i; //sum = '1+2+4+7+11+.....+ last second digit'
		k++;
	}
	sum = sum + n; //now sum = '1+2+4+7+11+.....+ last second digit + n'
	k = 0; //resets value of k to 0 to again use in upcoming for loop
	for (i=1; i<n; i+=k) //printing '+1+3+5+7+.......last second digit +'
	{
		printf ("%d + ", i);
		k++;
	}
	printf ("%d = %d", n, sum); //prints 'n = sum', n is last digit
	return 0;
}