error: 'for' loop initial declarations are only allowed in C99 or C11 mode

code::blocks编译排序算法时，报错

查询资料得知，C89变量定义只能在函数的开头，才明白为什么之前看到的代码for循环内的变量都在for外面定义，变量定义都写在函数的开头代码阅读起来很轻松。

详情请参阅： ANSI C与C89、C99、C11区别差异

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error: 'for' loop initial declarations are only allowed in C99 mode
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error: 'for' loop initial declarations are only allowed in C99 or C11 mode

详情请参阅： ANSI C与C89、C99、C11区别差异

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