#include<stdio.h>
struct student
{
    int no;
    char name[30];
    char sex;
    int score[3];
    int sum;
    float average;
};
main()
{
  struct student stu1;
  int i;
  stu1.sum=0;
  printf("\t\t\t请输入学号:");
  scanf("%d",&stu1.no);
  printf("\t\t\t请输入名字:");
  scanf("%s",&stu1.name);
  printf("\t\t\t请输入性别:");
  scanf("%s",&stu1.sex);
  printf("\t\t\t请输入三课分数:");
  for(i=0;i<3;i++)
  {
      scanf("%d",&stu1.score[i]);
      stu1.sum=stu1.score[i]+stu1.sum;
  }
  stu1.average=stu1.sum/3.0;
  printf("no:%d,name:%s,sex:%s,sum:%d,average:%f",stu1.no,stu1.name,stu1.sex,stu1.sum,stu1.average);
}
当输入数组时，内存出错

[ 本帖最后由 linxinqiang 于 2010-11-20 20:23 编辑 ]

scanf("%s",&stu1.sex); 错在这里

"%s" 改 " %c"，注意%c前面有空格

scanf("%s",&stu1.name);
对这些数组赋值时不必加地址符&,你把&去掉试试.

我这里说的数组是字符数组,不包括数字型的.

#include<stdio.h>
struct student
{
    int no;
    char name[30];
    char sex[10];
    int score[3];
    int sum;
    float average;
};
main()
{
  struct student stu1;
  int i;
  stu1.sum=0;
  printf("\t\t\t请输入学号:");
  scanf("%d",&stu1.no);
  printf("\t\t\t请输入名字:");
  scanf("%s",stu1.name);
  printf("\t\t\t请输入性别:");
  scanf("%s",stu1.sex);
  printf("\t\t\t请输入三课分数:");
  for(i=0;i<3;i++)
  {
      scanf("%d",&stu1.score[i]);
      stu1.sum=stu1.score[i]+stu1.sum;
  }
  stu1.average=stu1.sum/3.0;
  printf("no:%d,name:%s,sex:%s,sum:%d,average:%f",stu1.no,stu1.name,stu1.sex,stu1.sum,stu1.average);
}
我把你的改了一点点,就可以了.