c语言程序设计试题求2+4+6+......+100之和

Question

具体一点好吧，我考试呢，具体点分就给你了！

Answer 1

#include <stdio.h>
void main( )
{
int i,sum=0;
for(i=2;i<=100;i+=2)
sum+=i;
printf("sum=%d\n",sum);
}

Answer 2

#include "stdio.h"
main()
{
int sum=0,i;
for(i=2;i<=100;i=i+2)
sum=sum+i;
printf("sum=%d\n",sum);
}

Answer 3

int sum=0;
for (i=2;i<=100;i=i+2)
{
sum=sum+i;
}

Answer 4

int sum = 0;
for(int i=2;i<=100;i+=2)
sum+=i;