#include<stdio.h>
#include<conio.h>
void main()
{
     float max,total=0;
     float average;
     int i,n=0;
     
     struct stu
    {
        int num;
        char *name;
        char sex;
        float score;
    }boy[]={
              {101,"li ping",'M',45},
              {102,"zhang ping",'M',62.5},
              {103,"he fang",'F',97.5},
              {104,"cheng ling",'F',87},
              {105,"wang ming",'M',58},
              /*{106,"",'F',0},*/
            };
    max=boy[0].score;
    for(i=0;i<5;i++)
      {
      
        if(max<boy[i+1].score)
        {
            max=boy[i+1].score;
        }
        total+=boy[i].score;
        if(boy[i].score<60)
         {
           n+=1;
         }
       }
    printf("total=%f\n",total);
    printf("average=%f\n",total/5);
    printf("fail=%d\n",n);
    printf("max=%f\n",max);
    getch();
            
}
   在for()中，当i=4时，boy[4+1]不是超出范围了吗？怎么不会出错呢？郁闷啊，
请教

i=4的时候for已经不循环了，在加i+1=5
 没错阿。。
如果说你  i<=5 这样写的话就越界，

但是当i=4时，boy[i+1]=boy[5]了，但是程序中并没有boy[5]啊~

boy[]={
              {101,"li ping",'M',45},
              {102,"zhang ping",'M',62.5},
              {103,"he fang",'F',97.5},
              {104,"cheng ling",'F',87},
              {105,"wang ming",'M',58},
              /*{106,"",'F',0},*/ 没看清楚。我还以为这里也是。
确实是越界了

/*{106,"",'F',0}*/是我自己想加的，觉得加了这段好像就不越界了，对程序又不会有嘛影响

这种越界是不提示的。

C语言不检查上越界。

楼上的那个程序运行不能得到正确的结果，这是我改的代码。
#include<stdio.h>
#include<conio.h>
void main()
{
     float max=0,total=0;
     float average=0;
     int i,n=0;
     
     struct stu
     {
        int num;
        char *name;
        char sex;
        float score;
     }boy[5]={
              {101,"li ping",'M',45},
              {102,"zhang ping",'M',62.5},
              {103,"he fang",'F',97.5},
              {104,"cheng ling",'F',87},
              {105,"wang ming",'M',58},
              /*{106,"",'F',0},*/
            };
    for(i=0;i<5;i++)
    {
      
        if(max<boy[i].score)
            max=boy[i].score;
        total+=boy[i].score;
        if(boy[i].score<60)
            n+=1;
    }
    printf("total=%f\n",total);
    printf("average=%f\n",total/5);
    printf("fail=%d\n",n);
    printf("max=%f\n",max);
    getch();
            
}
望指点。

max最好不要用零；用数组你的第一个数，那个boy[i+1]可以换成boy[i]

[ 本帖最后由 xu362726904 于 2009-12-30 09:57 编辑 ]

要是原来的没错这样改一下就不会存在越界问题了·


[ 本帖最后由 jiangwu10057 于 2009-12-30 15:37 编辑 ]