error: #268: declaration may not appear after executable statement in block

问题：    ..\Main\voice.c(266): error:  #268: declaration may not appear after executable statement in block   
分析：    在编译STM32程序中，提示这个是因为把变量的声明放在了可执行语句的后面
如下面这几行代码：         
            if(index>=50 || length>=78)
            {
                return 0;   
            }
            uint8_t k, flag;
            uint8_t nAsrAddLength;
            flag = 1;

    
解决办法：把变量的声明放在可执行语句的前面。