“是什么意思” #define 1000 a“用C语言 [英] What is the meaning of " #define 1000 a" in C language

问题描述

上面定义的宏的价值是多少



我尝试过的事情：



我没有得到任何结果，请帮我

what is the value of that macro defined above

What I have tried:

I didn't get any result, Please help me

推荐答案

该语句无效，你不能改变常量的定义。我怀疑你的意思是：

That statement is invalid, you cannot change the definition of a constant. I suspect you mean:

#define a 1000

// now anywhere the compiler sees a it will replace it with 1000.
//
// e.g.

printf("The value of a is %d\n", a);

// will print
//    The value of a is 1000

#define是一个预处理器宏，例如

#define is a preprocessor macro, e.g.

#define a 1000

现在你可以使用a而不是1000.

在你的问题中你使用它错了，编译器打印错误E0040预期标识符。

Now you can use "a" instead of 1000.
In your question you use it wrong, the compiler prints error E0040 "expected an identifier".

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