Task: Prompt the user to enter two numbers as operands (type double), then print

Question

Task: Prompt the user to enter two numbers as operands (type double), then print a menu to let user know what options are available. Read the user’s selection to determine which operation the user has chosen. Use a switch statement with user input as the switch expression. Your switch has to provide two cases for each operation; for example “ADD” or “+“. For example, if the user enters ADD (in any combination of uppercase or lowercase letters) or a plus sign (+), your program will execute the addition and output the result. You should format your output to two decimal places.

Explanation / Answer

Language: C

Here's the code:

#include <stdio.h>

int main()
{
double a,b;
char c;
printf("Please select an operation from the following options: ");
printf("Press + for addition ");
printf("Press - for subtraction ");
printf("Enter your choice: ");
scanf("%c", &c);
  
switch(c)
{
case '+':
printf ("Please enter two numbers as operands (double): ");
scanf (" %lf %lf",&a, &b);
printf(" Addition of entered numbers are: %.2lf",a+b);
break;

case '-':
printf ("Please enter two numbers as operands (double): ");
scanf (" %lf %lf",&a, &b);
printf(" Subtraction of given numbers are: %.2lf", a-b);
break;
  
default:
printf (" Please select a valid option");
printf(" press Enter key to exit"); break;

}
getch();
return 0;
  
}

Output:

Please select an operation from the following options:
Press + for addition
Press - for subtraction
Enter your choice:
+
Please enter two numbers as operands (double):
210.12
993.114

Addition of entered numbers are: 1203.23

Please select an operation from the following options:
Press + for addition
Press - for subtraction
Enter your choice:
*

Please select a valid option
press Enter key to exit

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