C变量声明的地方 [英] C variable declaration place

问题描述

可能重复：结果
  用C 变量声明安置

Possible Duplicate:
Variable declaration placement in C

我真的不明白，为什么当我在下面，为什么它不工作文档片断code声明变量M状???我声明米之前，我用它有啥点？谢谢

I really dont understand why when I declare variable 'm' like in snipped code below why it doesn't work???I declare m before I use it so what's the point?? thanks

    int main(){

    int a[] = {2,-4,6,47,59,-6,0};
    sort(a, 7);

    int m;
    for(m = 0; m < 7; m++){
        printf("%d ",a[m]);
    }
}

但是，如果我把宣言beggining，数组上面，它的工作原理。

But if I put declaration at beggining, above the array, it works.

推荐答案

看起来你是在ANSI C模式下编译。在C89，变量声明仅在一个块的开头不允许的。

Looks like you are compiling in ANSI C mode. In C89, variable declaration is allowed only at the beginning of a block.

由于C99，这一限制已被删除。与 -std = C99 编译，让您在任何地方声明变量。

Since C99, this restriction has been removed. Compile with -std=c99 which will allow you to declare variables anywhere.

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