Write a c program to find out the sum of series 1 + 2 + …. + n.

Output:
Enter the n i.e. max values of series: 5
Sum of the series: 1 + 2 + 3 + 4 + 5 = 15
Mathematical Formula: Sum of the series 1 + 2 + 3 + … + n = n (n+1)/2

Code:
#include<stdio.h>
int main(){
int n,i;
int sum=0;


printf("Enter the n i.e. max values of series: ");
scanf("%d",&n);

sum = (n * (n + 1)) / 2;

printf("Sum of the series: ");

for(i =1;i <= n;i++){
if (i!=n)
printf("%d + ",i);
else
printf("%d = %d ",i,sum);
}
return 0; }