keil中变量声明问题及error: #268: declaration may not appear after executable statement in block
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在keil中编译程序时提示:error: #268: declaration may not appear after executable statement in block
错误,说是声明不能在执行语句后,也就是说变量的声明写在了使用语句的后面,导致程序在编译链接时,使用到该变量的语句找不到这个变量,故出错。
这其实与keil所采用的标准有关,Keil5(版本是5,14.2)默认采用C89标准,这个标准要求在编写程序时变量不能放在函数体中间,只能在函数最开始定义或声明变量。如何修改呢?
方法1
将变量都放在函数最开头,且注意变量在函数体中出现的先后顺序,应该按照后面使用的顺序进行定义或声明变量,否则仍会报同样的错。
//报错代码damage_flag = 0;u16 i = 0;s16 mean = 0;s16 Cpoy_signalData[L]={0};//copy signaldatas16 temp[L] = {0};//memcpy(Cpoy_signalData,signalData,sizeof(signalData));mean = GetMean(Cpoy_signalData,L);
//修改后代码s16 Cpoy_signalData[L]={0};//copy signaldatas16 mean = 0;u16 i = 0;s16 temp[L] = {0};//damage_flag = 0; memcpy(Cpoy_signalData,signalData,sizeof(signalData));mean = GetMean(Cpoy_signalData,L);
方法2
将keil的标准改为C99,重新编译即可。如图所示,在option的C/C++标签中勾选上C99 Mode
选项(在中间右侧)。
相关介绍
C89与C99标准介绍
C89与C99区别
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