Thread: I have a problem with Switches..

I want to make a switch program where letters are choices. I already know that you must use the newline technique but I wanted to know how you would use both upper case and lower case letters without writing a completely different case for each letter.

Example:

Code:

switch(choice)
      {
	 case 'A': 
	    sum = num1 + num2;
	    printf("The sum of %d and %d is %d.\n", num1, num2, sum);
	    break;

Originally Posted by itsme86

By default, a case will "fall through" to the next case. That's why you typically end each case with a break statement. So to handle both upper and lowercase letters you can use the fall through behavior to your advantage:

Code:

switch(choice)
{
  case 'a':  // Fall through to 'A' case because of lack of break;
  case 'A':
    // Do stuff for 'a' or 'A'
    break;
}

Alternatively, you could force the choice to one case or the other. Something like:

Code:

switch(toupper(choice))
{
  case 'A':
    // Do stuff for 'a' or 'A'
    break;
}

If you decide to use toupper() make sure you #include <ctype.h>

Thank you very much.. I will try that..