[Error] lvalue required as left operand of assignment 要把赋值号改为关系运算符
[Error] 'sqrt' was not declared in this scope 标识符在其出现的地方是未定义的
[Error] stary '\273' in program 代码中存在中文字符
[Error] expected identifier before'scanf' 重复使用标识符
[Error] stary '\243' in program 不可识别非法字符
