View Code of Problem 30

#include <stdio.h>
int main()
{
	int n,sum=0;
  	while (scanf("%d",&n)!=EOF)
        {
        	for(i=0;i<n;++i)
                  sum+=i;
                  printf("%d",sum);
        
        }



}
/*
Main.c: In function 'main':
Main.c:7:14: error: 'i' undeclared (first use in this function)
          for(i=0;i<n;++i)
              ^
Main.c:7:14: note: each undeclared identifier is reported only once for each function it appears in
*/