create a simple calculator using c programming

  /*create a simple calculator using c programming */

 #include"stdio.h"

 int main (){

double num1,num2,result;

char operator;

printf ("enter two numbers and  type of operator : ");

scanf ("%lf %lf %c",&num1,&num2,&operator );

switch (operator ){

   case '+':

result=num1+num2;

printf ("the result is %lf",result);

break;

   case '-':

result=num1-num2;

printf ("the result is %lf",result);

break;

   case '*':

result=num1*num2;

printf ("the result is %lf",result);

break;

   case '/':

result=num1/num2;

printf ("the result is %lf",result);

break;

default:

printf ("invailed operator ");

}

return 0;

 }

output output output output

enter two numbers and type of operator : 40 20 * the result is 800.000000