p2-1.c

来自「UNIX程序设计教程」· C语言 代码 · 共 22 行

#include <stdio.h>
int main(void)
{
    FILE *stream;
    char buf[80];
    printf("open and creat test_file\n");
    if ((stream = fopen("test_file","w")) == NULL ){
        perror("open() failed");
        exit(1);
    }
    printf("write string to test_file\n");
    fputs("Hello world",stream);
    if ((stream = freopen("test_file","r",stream)) == NULL ){
        perror("open() failed");
        exit(1);
    }
    printf("read string from test_file\n");
    fgets(buf, sizeof(buf), stream);
    printf("the string is \"%s\"\n", buf);
    fclose(stream);
}