从文件中读取第一行的程序
#include <stdio.h> #include <stdlib.h> // for exit() function int main() { char c[1000]; FILE *fptr; if ((fptr = fopen("program.txt", "r")) == null) { printf("Error! File cannot be opened."); // Program exits if the file pointer returns null. exit(1); } // reads text until newline is encountered fscanf(fptr, "%[^\n]", c); printf("Data from the file:\n%s", c); fclose(fptr); return 0; }
如果找到文件,程序会将文件内容保存到字符串
c 中,直到遇到
'\n'
换行符。
假设
program.txt
文件在当前目录中包含以下文本。
C programming is awesome. I love C programming. How are you doing?
程序的输出将是:
Data from the file: C programming is awesome.
如果文件
program.txt
没有找到,程序会打印错误信息。