C語言-從1+到100語法

#include <cstdlib>
#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
   int i;
   int sum;
   sum=0;
    for( i = 1 ; i <= 100 ; ++i )
      
    sum=sum+i;
  
       printf("從1+2+3...+100=%d",sum);
      
      
       system("pause");
       return EXIT_SUCCESS;
}