这个程序运行为什么崩溃
#include <stdio.h>#include <stdlib.h>
#include <string.h>
#define MAX_NAME_LENGTH 20
#define MAX_STUDENT_NUMBER 10
#define MAX_CLASS_NUMBER 10
typedef struct student
{
char name;
unsigned short int age;
unsigned short int class_number;
unsigned short int chinese_scores;
unsigned short int math_scores;
unsigned short int english_scores;
}Student;
typedef struct stu_class
{
Student students;
unsigned short int class_number;
}Stu_Class;
typedef struct class_system
{
Stu_Class stu_class;
//unsigned short int class_sum;
}Class_System;
Class_System class_system;
void Init_Class_System()
{
memset(&class_system,0,sizeof(Class_System));
printf("class_system initialization success\n");
}
void Add_A_Student_To_Class_System()
{
char name ={'\0'};
unsigned short int age;
unsigned short int class_number;
unsigned short int chinese_scores;
unsigned short int math_scores;
unsigned short int english_scores;
unsigned short int number;
printf("please input name,age,class_number(1-9),chinese score,math score, english score and the number(1-9)\n");
scanf("%s,%d,%d,%d,%d,%d,%d\n",name,&age,&class_number,
&chinese_scores,&math_scores,&english_scores,&number);
strcpy(class_system.stu_class.students.name,name);
class_system.stu_class.students.age = age;
class_system.stu_class.students.class_number = class_number;
class_system.stu_class.students.chinese_scores = chinese_scores;
class_system.stu_class.students.math_scores = math_scores;
class_system.stu_class.students.english_scores = english_scores;
printf("Add student info success!\n");
}
int main()
{
int i;
Init_Class_System();
for(i = 0; i<10;i++)
{
Add_A_Student_To_Class_System();
}
return 0;
}
因为scanf函数输入错误，导致其他值没有被赋值。然后访问数组成员时越界导致的segment fault。
修改一下scanf就好了。scanf输入%s时需要额外注意，他只能放在所有数字输入之后，或者单独输入一行用于保存文本(name)。%s在最开头表示整行输入数据都给了name，导致其余变量没有正确的值。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_NAME_LENGTH 20
#define MAX_STUDENT_NUMBER 10
#define MAX_CLASS_NUMBER 10
typedef struct student
{
char name;
unsigned short int age;
unsigned short int class_number;
unsigned short int chinese_scores;
unsigned short int math_scores;
unsigned short int english_scores;
}Student;
typedef struct stu_class
{
Student students;
unsigned short int class_number;
}Stu_Class;
typedef struct class_system
{
Stu_Class stu_class;
//unsigned short int class_sum;
}Class_System;
Class_System class_system;
void Init_Class_System()
{
memset(&class_system,0,sizeof(Class_System));
printf("class_system initialization success\n");
}
void Add_A_Student_To_Class_System()
{
char name ={'\0'};
unsigned short int age = 0;
unsigned short int class_number = 0;
unsigned short int chinese_scores = 0;
unsigned short int math_scores = 0;
unsigned short int english_scores = 0;
unsigned short int number = 0;
//printf("please input name,age,class_number(1-9),chinese score,math score, english score and the number(1-9)\n");
printf("input class_number(1-9), stu number(1-9),age, chinese score, math score, english score and name.\n");
//scanf("%s,%h,%h,%h,%h,%h,%h",name,&age,&class_number,
// &chinese_scores,&math_scores,&english_scores,&number);
scanf("%hd,%hd,%hd,%hd,%hd,%hd,%s", &class_number, &number, &age, &chinese_scores, &math_scores, &english_scores, name);
printf("class_nu:%d,number:%d, age:%d,chinese:%d,math:%d,english:%d,name:%s.\n",
class_number, number, age, chinese_scores, math_scores, english_scores, name);
//input format: 1,2,3,4,5,6,tom
strcpy(class_system.stu_class.students.name,name);
class_system.stu_class.students.age = age;
class_system.stu_class.students.class_number = class_number;
class_system.stu_class.students.chinese_scores = chinese_scores;
class_system.stu_class.students.math_scores = math_scores;
class_system.stu_class.students.english_scores = english_scores;
printf("Add student info success!\n");
}
int main()
{
int i;
Init_Class_System();
for(i = 0; i<10;i++)
{
Add_A_Student_To_Class_System();
}
return 0;
}
回复 2# 451006071
谢谢啊，真的是这样，我自己调了很久都没想明白问题在哪儿，还以为是初始化的问题
segment fault
一般是没有写过代码的人才会问，{:yxh5:}
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