IO进程线程8月21日

1，思维导图

2，登录

#ifndef __LOG_H__
#define __LOG_H__
#include<myhead.h>
typedef struct
{char name[20];char pwd[20];
}str;int regist();int login();
#endif#include"log.h"
int login()
{char a[20]="\n";str p,s;printf("输入登录账户：");fgets(p.name,sizeof(p.name),stdin);printf("输入登录密码：");fgets(p.pwd,sizeof(p.pwd),stdin);printf("%ld%ld",strlen(p.name),strlen(p.pwd));//	p.name[strcspn(p.name,"\n")]='\0';
//	p.pwd[strcspn(p.pwd,"\n")]='\0';FILE *fp=fopen("./user.txt","r");fscanf(fp,"%s%s",s.name,s.pwd);strcat(s.name,"\n");strcat(s.pwd,"\n");if(strcmp(p.name,s.name)==0&&strcmp(p.pwd,s.pwd)==0){printf("登录成功！！！\n");}else{printf("登录失败！！！\n");}return 0;
}#include"log.h"
int regist()
{str s;FILE *fp=fopen("./user.txt","w");if(fp==NULL){perror("fopen");return -1;}printf("建立新账户：");fgets(s.name,sizeof(s.name),stdin);printf("建立新密码：");fgets(s.pwd,sizeof(s.pwd),stdin);fprintf(fp,"%s%s",s.name,s.pwd);fclose(fp);printf("注册成功！！！\n");return 0;
}#include"log.h"
int main()
{int n;while(1){printf("1.注册账户\n");printf("2.登录账户\n");printf("3.退出\n");printf("请选择：");scanf("%d",&n);getchar();switch(n){case 1:regist();break;case 2:login();break;case 3:exit(0);}}return 0;
}

3，复制

#include<myhead.h>
int main(int argc, const char *argv[])
{FILE *fp1=fopen("./1.txt","r");FILE *fp2=fopen("./2.txt","w");char str[5];while(1){fread(str,sizeof(str),1,fp1);if(feof(fp1)){printf("读取成功！！！\n");break;}else if(ferror(fp1)){printf("读取失败！！！\n");break;}fwrite(str,sizeof(str),1,fp2);}fclose(fp1);fclose(fp2);fp2=fopen("./2.txt","r");while(fgets(str,sizeof(str),fp2)){fputs(str,stdout);}fclose(fp2);putchar(10);return 0;
}