文件操作（讀）

讀一行：

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
const int maxn  = 10;
int main()
{char s[1024] = {0};FILE *p = fopen("/home/exbot/wangqinghe/C/20190716/file.txt","r");//第一個參數是一個內存地址，第二個參數是這塊內存的大小，
//第三個參數是fopen返回的文件指針
    fgets(s,maxn,p);printf(" s = %s\n",s);fclose(p);return 0;
}

讀所有：

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
const int maxn  = 10;
int main()
{char s[1024] = {0};FILE *p = fopen("/home/exbot/wangqinghe/C/20190716/file.txt","r");//feof(p) p文件到尾部則返回正while(!feof(p)){memset(s,0,sizeof(s));fgets(s,sizeof(s),p);printf("%s\n",s);    }fclose(p);return 0;
}

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