c語言中如何用代碼設計壹個簡單計算器，實瑞兩個浮點數的加減乘除，界面如圖

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 '+': printf("value=%lf",first_number+second_number );break;

case '-': printf("value=%lf",first_number-second_number );break;

case '*': printf("value=%lf",first_number*second_number );break;

case '/': {if(second_number==0) printf("wrong number\n");

else printf("value=%lf",first_number/second_number);}

}

}