变量设置不同~~结果不同~~指针问题~~
源程序里对member的设置是普通结构变量，本人将Family member改成Family *member，对应的将&member改成了member，更改之后能正常封装，但是运行之后进行几次输入就强制关闭程序了。想请教大侠这是为什么。源程序在下面http://my.oschina.net/u/1408882/blog/185409
更改之后的程序如下
#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#include<stdbool.h>
#include<string.h>
#define NAME_MAX 20
struct
{
char *filename;
FILE *pfile;
}global={"E:\\myfile.bin",NULL};
struct Date
{
int day;
int month;
int year;
};
typedef struct family
{
struct Date dob;
char name[NAME_MAX];
char pa_name[NAME_MAX];
char ma_name[NAME_MAX];
}Family;
bool get_person(Family *pfamily);
void getname(char *name);
void show_person_data(void);
void get_parent_dob(Family *pfamily);
int main(void)
{
Family *member;
if(!(global.pfile=fopen(global.filename,"wb")))
{
printf("\nUnable to open %s for writing.\n",global.filename);
exit(1);
}
while(get_person(member))
fwrite(member,sizeof(member),1,global.pfile);
fclose(global.pfile);
show_person_data();
if(remove(global.filename))
printf("\nUnable to delete %s.\n",global.filename);
else
printf("\nDeleted %s OK.\n",global.filename);
return 0;
}
bool get_person(Family *temp)
{
static char more='\0';
printf("\nDo you want to enter details of a%s person(Y or N)?",
more!='\0'?"nother":"");
scanf(" %c",&more);
if(tolower(more)=='n')
return false;
printf("\nEnter the name of the person:");
getname(temp->name);
printf("\nEnter %s's date of birth (day month year);",temp->name);
scanf("%d %d %d",&temp->dob.day,&temp->dob.month,&temp->dob.year);
printf("\nWho is %s's father?",temp->name);
getname(temp->pa_name);
printf("\nWho is %s's mother?",temp->name);
getname(temp->ma_name);
return true;
}
void getname(char *name)
{
fflush(stdin);
fgets(name,NAME_MAX,stdin);
int len=strlen(name);
if(name[len-1]=='\n')
name[len-1]='\0';
}
void show_person_data(void)
{
Family member;
fpos_t current=0;
if(!(global.pfile=fopen(global.filename,"rb")))
{
printf("\nUnable to open %s for reading.\n",global.filename);
exit(1);
}
while(fread(&member,sizeof member,1,global.pfile))
{
fgetpos(global.pfile,¤t);
printf("\n\n%s's father is %s,and mother is %s",
member.name,member.pa_name,member.ma_name);
get_parent_dob(&member);
fsetpos(global.pfile,¤t);
}
fclose(global.pfile);
}
void get_parent_dob(Family *pmember)
{
Family relative;
int num_found=0;
rewind(global.pfile);
while(fread(&relative,sizeof(Family),1,global.pfile))
{
if(strcmp(pmember->pa_name,relative.name)==0)
{
printf("\nPa was born on %d/%d/%d",
relative.dob.day,relative.dob.month,relative.dob.year);
if(++num_found==2)
return;
}
else
if(strcmp(pmember->ma_name,relative.name)==0)
{
printf("\nMa was born on %d/%d/%d.",
relative.dob.day,relative.dob.month,relative.dob.year);
if(++num_found==2)
return;
}
}
}
