小菜，求助学生分数管理系统的改错
我编了个学生分数管理系统但总是出现内存分配错误，请问下问题出在哪？#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<conio.h>
#include<malloc.h>
struct student{
char name[20];
int score;
struct student *next;
};
struct student *ptr,*head,*this,*prev;
void ini_func(void);
void insert_func(void);
void sort_func(void);
void delete_func(void);
void modify_func(void);
void display_func(void);
void anykey_func(void);
int main()
{
char option;
ini_func();
while(1){
printf("*********************\n");
printf("1 insert\n");
printf("2 delete\n");
printf("3 display\n");
printf("4 modify\n");
printf("5 quit\n");
printf("*********************\n");
printf("please enter your choose");
option=getche();
printf("\n");
switch(option){
case '1':
insert_func();
break;
case '2':
delete_func();
break;
case '3':
display_func();
break;
case '4':
modify_func();
break;
case '5':
exit(0);
defult:
printf("error!please enter again\n");
}
}
return 0;
}
void ini_func(void)
{
head=(struct student*)malloc(sizeof(struct student));
head->next=NULL;
}
void insert_func(void)
{
char s_temp[4];
ptr=(struct student*)malloc(sizeof(struct student));
if(!ptr)exit(0);
printf("plese enter the students name ");
gets(ptr->name);
printf("please enter the students store ");
gets(s_temp);
ptr->score=atoi(s_temp);
sort_func();
}
void sort_func(void)
{
prev=head;
this=head->next;
while(!this&&(ptr->score>this->score)){
prev=this;
this=this->next;
}
ptr->next=this;
prev->next=ptr;
}
void delete_func(void)
{
char de_name[20];
printf("delete student name\n");
gets(de_name);
prev=head;
this=head->next;
while(!this&&strcmp(this->name,de_name)){
prev=this;
this=this->next;
}
if(this){
prev->next=this->next;
free(this);
}else{
printf("no the name\n");
}
anykey_func();
}
void modify_func(void)
{
char mo_name[20],mo_score[4];
printf("modify student name");
gets(mo_name);
prev=head;
this=head->next;
while(!this&&strcmp(this->name,mo_name)!=0){
prev=this;
this=this->next;
}
if(this){
printf("************************\n");
printf(" the student name is %s",this->name);
printf(" the student score is %d",this->score);
printf("*************************\n");
printf(" please enter new score:");
gets(mo_score[4]);
this->score=atoi(mo_score[4]);
printf("%s student record is modified %d\n",this->name,this->score);
}else{
printf("no this student\n");
}
anykey_func();
}
void display_func(void)
{
if(!head->next)
printf("there is no student");
while(!this){
printf("%-20s the score is %3d",this->name,this->score);
this=this->next;
}
printf("_______________________\n");
anykey_func();
}
void anykey_func(void)
{
printf("press any key to continue\n");
getch();
printf("\n");
}
我估计是sort和anykey函数有问题？请指教
页:
[1]