#include<stdio.h>
int mian()
{
    int i=1;
    int a=0;
    while(i<=100)
    {
        if(i%2==0)
            a=a+i;
            i++;
            continue;
        else
            i++;
           printf("%d\n",a);
        
    }
    printf("一百以内偶数和为%d\n",a);
    return 0;
}

错误显示是   else 和  if 不匹配

//不匹配是因为if后面三句没有打{}
#include <stdio.h>
int mian()
{
    int i=1;
    int a=0;
    
    while(i<=100)
    {
        if(i%2==0)  a=a+i;
        i++;
        //printf("%d\n",a);
        
    }
    printf("一百以内偶数和为%d\n",a);
    return 0;
}

if(i%2==0)
{
            a=a+i;
            i++;
            continue;
}
        else
{
            i++;
           printf("%d\n",a);
}

#include<stdio.h>
int mian()
{
    int i=1;
    int a=0;
    while(i<=100)
        if(i%2==0)
        {
            a=a+i;
            i++;
            continue;
        }
        else
        {
            i++;
            printf("%d\n",a);
        }
        printf("%d\n",i);
        return 0;
}
这样吗 我带进去了 还是不匹配

#include <stdio.h>
int mian()
{
    int i=1;
    int a=0;
   
    while(i<=100)
    {
        if(i%2==0)
            a=a+i;
        i++;
        //printf("%d\n",a);
        
    }
    printf("一百以内偶数和为%d\n",a);
    return 0;
}

不对啊 这样

while的{}没了。

啊？

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

        while(i<=100)
        {
            
            if(i%2==0)
            {   
                  sum+=i;         //    sum=sum+i;
               }
            i++;            //    i=i+1;
        
        }
        
    printf("1-100的偶数sum=%d\n\n",sum);
    return 0;
}

[此贴子已经被作者于2016-4-28 12:37编辑过]

if和else语句只识别紧接着的语句，你需要添加块语句

#include<stdio.h>
int mian()
{
    int i=1;
    int a=0;
    while(i<=100)
    {
        if(i%2==0)
        {   
            a=a+i;
            i++;
            continue;
        }
        else
        {
           i++;
           printf("%d\n",a);
        }
    }
    printf("一百以内偶数和为%d\n",a);
    return 0;
}