#include <stdio.h>
#include <stdlib.h>


int main()
{
    int odd_num = 0;
    int even_num = 0;
    int i = 0;
   
    for(i = 0;i <= 1000;i++)
      if( i%2 == 0 )
      {
          even_num = even_num + i;
      }else{
          odd_num = odd_num + i;
      }  
   
    printf("even_num  = %d\n",even_num);
    printf("odd_num = %d\n",odd_num);
   
    system("pause");
    return 0;
}

int i,a,b;
for(i=o;i<=1000;i=i+2)
{a+=i;
}
for(i=1;i<=1000;i=i+2)
{b+=i；
}
print("a=%d",a);
print("b=%d",d);

弱弱的问一句，后面那个
return 0
是什么意思啊？？

#include "stdafx.h"
void  main(int argc, char* argv[])
{
    int i,sum1=0,sum2=0;
    for(i=1;i<=1000;i++){
        if(i%2) sum1=sum1+i;
        else    sum2=sum2+i;
    }
    printf("奇数和：%d\n",sum1);
    printf("偶数和：%d\n",sum2);
}

[local]1[/local]

#include<stdio.h>

void main ()

{

    int i, sum1, sum2;

    sum1 = 0;

    sum2 = 0;

    for (i = 1; i <= 100; i++)

        if (i % 2 == 0)

            printf ("100以内的偶数和为%d",sum1);

            printf ("100以内的奇数和为%d",sum2);

}