C语言中的文件操作(二)-CSDN博客https://blog.csdn.net/Xiaodao12345djs/article/details/142748215?spm=1001.2014.3001.5501
fputs (文本行输入/写)
- str 指向要输入的字符串
- stream 指向要存放字符串的文件
#include <stdio.h>int main()
{FILE* pf = fopen("test.txt", "w");//如果打开失败,返回空指针NULLif (pf == NULL){perror("fopen");return 1;}//写操作fputs("hello world\n", pf);fputs("haha\n", pf);//关闭文件fclose(pf);pf = NULL;return 0;
}
fgets (字符串输入/写)
#include <stdio.h>int main()
{FILE* pf = fopen("test.txt", "r");//如果打开失败,返回空指针NULLif (pf == NULL){perror("fopen");return 1;}//读操作char arr[20] = { 0 };fgets(arr, 5, pf);printf("%s\n", arr);fgets(arr, 5, pf);printf("%s\n", arr);//关闭文件fclose(pf);pf = NULL;return 0;
}
读取到的字符个数是n-1个+一个'\0',比如上方代码,只会读hell+'\0',然后再继续读4个字符+‘\0’
当改成读取20个字符,文件里第一行不够20个字符,只读第一行再只读第二行