C 系统函数在其他字符串之前获取

Question

我正在尝试编写一个简单的 C 程序来打印 C 编译器版本。所以我写道:

#include <stdio.h>
int main() {
    printf("you have %d", system("gcc --version");
}

输出:

gcc (Ubuntu 4.8.4-2ubuntu1~14.04.1) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

you have compiler 0

有什么想法吗？

Answer 1

system 执行 shell 命令并返回命令的状态。在您的情况下，值为 0 意味着命令已成功运行。