调用字符串处理函数是出现...was not declared in this scope ,怎样解决.拜求!

lable' was not declared in this scope 程序老是报错 `a' was not declared in this scope 怎样调用sqrt函数求平方根程序编程 帮忙看看哪里错了~~编写一个,功能是：返回字符串中指定字符的个数.在主函数中读入一个字符串,并读入一个要统计的字符,调用 反渗透处理设备中,多介质过滤器中出现的问题怎样解决? Matlab函数怎样调用工作区变量 请问MATLAB怎样调用function函数? 如： matlab中调用solve函数出错?怎么解决 MATLAB函数调用时为什么出现 In an assignment A(I) = B,the number of ele 怎样讲好生物课,拜求 He made ( ) clear ( ) he was not interested in this subject 65　程序D1048.c的功能是：在主函数中输入6个字符串,调用另一个函数func对他们按从小到大的顺序排序,然后在主函