user2649696 - 12 days ago 4x
C Question

# C - Switch with multiple case numbers

So my professor asked us to create a switch statement. We are allowed to use only the "SWITCH" statement to do the program. He wants us to input a number and then display it if it is on the number range and what briefcase number will be taken as shown below. Now... I know that for this type of program it is easier to use the IF statement. Doing Case 1: Case 2: Case 3...Case 30 will work but will take too much time due to the number range.

``````#include <stdio.h>
main()
{
int x;
char ch1;
printf("Enter a number: ");
scanf("%d",&x);
switch(x)
{
case 1://for the first case #1-30
case 30:
printf("The number you entered is >= 1 and <= 30");
printf("\nTake Briefcase Number 1");
break;
case 31://for the second case #31-59
case 59:
printf("The number you entered is >= 31 and <= 59");
printf("\nTake Briefcase Number 2");
break;
case 60://for the third case #60-89
case 89:
printf("The number you entered is >= 60 and <= 89");
printf("\nTake Briefcase Number 3");
break;
case 90://for the fourth case #90-100
case 100:
printf("The number you entered is >= 90 and <= 100");
printf("\nTake Briefcase Number 4");
break;
default:
printf("Not in the number range");
break;

}
getch();
}
``````

My professor told us that there is a shorter way on how to do this but won't tell us how. The only way I can think of shortening it is by using IF but we are not allowed to. Any Ideas on how I can make this work out?

With GCC and CLang, you can use case ranges, like this:

``````switch (x){

case 1 ... 30:
printf ("The number you entered is >= 1 and <= 30\n");
break;
}
``````

The only cross-compiler solution is to use case statements like this:

``````switch (x){

case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
printf ("The number you entered is >= 1 and <= 6\n");
break;
}
``````

Edit: Using something to the effect of `switch (x / 10)` is another good way of doing this. It may be simpler to use GCC case ranges when the ranges aren't differences of `10`, but on the other hand your professor might not take a GCC extension as an answer.

Source (Stackoverflow)