#include<stdlib.h>
#include<string.h>
//注册
void register_user()
{
char name[20]
char psw[20]
printf("请输入要注册的用户名:")
scanf("%s",name)
printf("请输入要注册的密码:")
scanf("%s",psw)
//将用户名保存到User.txt文件中
FILE *fp1 = fopen("C:\\User.txt","a+")
if(fp1 == NULL)
{
printf("文件打开失败!\n")
exit(0)
}
fprintf(fp1,"%s\n",name)
fclose(fp1)
//将密码保存到PSW.txt文件中
FILE *fp2 = fopen("C:\\PSW.txt","a+")
if(fp2 == NULL)
{
printf("文件打开失败!\n")
exit(0)
}
fprintf(fp2,"%s\n",psw)
fclose(fp2)
printf("注册成功!\n")
}
//修改密码
void modify_psw()
{
char name[20]
char psw[20]
char temp[20]
int i
printf("请输入要修改密码的用户名:")
scanf("%s",name)
//从User.txt文件中获取用户名
FILE *fp1 = fopen("C:\\User.txt","r")
if(fp1 == NULL)
{
printf("文件打开失败!\n")
exit(0)
}
i = 0
while(fscanf(fp1,"%s",temp) != EOF)
{
if(strcmp(temp,name) == 0)
{
break
}
i++
}
fclose(fp1)
if(i == 0)
{
printf("没有此用户!\n")
return
}
printf("请输入新密码:")
scanf("%s",psw)
//从PSW.txt文件中修改密码
FILE *fp2 = fopen("C:\\PSW.txt","r+")
if(fp2 == NULL)
{
printf("文件打开失败!\n")
exit(0)
}
for(int j = 0j <ij++)
{
fscanf(fp2,"%s",temp)
}
fseek(fp2,-strlen(temp),SEEK_CUR)
fprintf(fp2,"%s",psw)
fclose(fp2)
printf("修改成功!\n")
}
int main()
{
int choice
while(1)
{
printf("1.注册\n")
printf("2.修改密码\n")
printf("0.退出\n")
printf("请选择:")
scanf("%d",&choice)
switch(choice)
{
case 1:
register_user()
break
case 2:
modify_psw()
break
case 0:
return 0
default:
printf("输入错误!\n")
break
}
}
return 0
}
====
请采纳,谢谢。
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