c - 在 C 中的 for 循环中重新声明变量

Question

我在 GCC 上使用 gcc prog.c -Wall -Wextra -std=gnu11 -pedantic 命令编译了以下程序编译器。我想知道，它工作正常，没有任何警告或错误。

#include <stdio.h>

int main(void)
{
    for (int i = 0; i == 0;  i++) 
    {        
        printf("%d\n", i);
        long int i = 1; // Why doesn't redeclaration error?
        printf("%ld\n", i);
    }
}

为什么编译器不生成重声明变量i错误？

Answer 1

来自标准 §6.8.5.5 ( N1570 )

An iteration statement is a block whose scope is a strict subset of the scope of its enclosing block. The loop body is also a block whose scope is a strict subset of the scope of the iteration statement.

^{添加了强调}