用C语言实现将字符串形式的运算转换为四则运算-Using C language to convert the string in the form of arithmetic operations

四则运算求值，c实现基础的四则运算计算，通过输入的字符串转换得到结果-si ze yun suan qiu zhi

命令行参数完成俩个浮点数的四则运算 加法 减法 乘法 于除法的运算(Command line arguments complete four operations of two floating-point numbers, add, subtract, multiply, and divide operations)