[国嵌攻略][076][库函数方式文件编程]

#include<stdio.h>

void main(){
    //打开文件
    FILE *fp;
    
    fp = fopen("test.txt", "r+");
    if(fp == NULL){
        printf("File open fail!\n");
    }
    
    //写入数据
    char wbuf[10] = "54321";
    
    fwrite(wbuf, 5, 1, fp);
    
    //定位文件
    fseek(fp, 0, SEEK_SET);
    
    //读取数据
    char rbuf[10];
    
    fread(rbuf, 5, 1, fp);
    rbuf[5] = '\0';
    
    //显示内容
    printf("read buffer is %s\n", rbuf);
    
    //关闭文件
    fclose(fp);
}