Question

我正在编写我的第一个程序，而且我遇到了直接的障碍。我只是想在屏幕上获得一些简单的文本行，但是当我编译并运行程序时，我得到了：

/用户/ MYNAME /桌面/程序 -bash：/ Users / myname / Desktop / program：权限被拒绝 name-mbp：~myname $

我正在使用Mac，并且对命令行不太熟悉。有什么我做错了吗？这是该计划：

/* Prints a message on the screen */
#include <stdio.h>
main ()
{

    printf("Just one small step for coders. One giant leap for") ;
    printf(" programmers!\n") ;
    return 0;

}

任何想法或反馈都会得到真正的赞赏。提前谢谢。

Answer 1

这是我在试图让你的简单程序运行时犯错的一个例子。 Shell提示以$开头，我的评论以#开头，读起来像评论：

$ cat step.c
/* Prints a message on the screen */
#include <stdio.h>
main ()
{
    printf("Just one small step for coders. One giant leap for") ;
    printf(" programmers!\n") ;
    return 0;
}
$ gcc -Wall step.c
step.c:3:1: warning: return type defaults to ‘int’ [-Wreturn-type]
 main ()
 ^
# running gcc with -Wall turns on all warnings
# there is a warning on line 3, but it is tolerable
$ ls step
ls: cannot access step: No such file or directory
# gcc does not make a binary named after the source file
$ ls -l a.out
-rwxrwxr-x 1 msw msw 8562 May 22 03:50 a.out
# it does make a binary file called a.out which is executable (x)
$ a.out
a.out: command not found
# oops, the current directory is not in my path so the shell doesn't
# look here for executables
$ ./a.out
Just one small step for coders. One giant leap for programmers!
# but if I tell it to look in my current directory, it does
$ gcc -o step step.c
#what does gcc do if I tell it the binary should be named "step"?
$ ls -l step
-rwxrwxr-x 1 msw msw 8562 May 22 03:51 step
# it makes a bnary called "step"
$ ./step
Just one small step for coders. One giant leap for programmers!
# which I can run

简单C程序拒绝Bash返回权限

1 个答案: