c语言中如何用代码设计一个简单计算器，实瑞两个浮点数的加减乘除，界面如图

# include void main() { double first_number,second_number,value; char Operator; printf("please enter the number:\n"); scanf("%lf%c%lf",&first_number,&Operator,&second_number); switch(Operator) { case '+