C Programming Puzzle : Switch and Variable name Validity

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This Program at a First Glance is error Free but It has one Serious Bug , Will you remove it without compiling it ?

#include<stdio.h>
void OS_Solaris_print()
{
        printf("Solaris - Sun Microsystems\n");
}
void OS_Windows_print()
{
        printf("Windows - Microsoft\n");
}
void OS_HP-UX_print()
{
        printf("HP-UX - Hewlett Packard\n");
}
int main()
{
        int num;
        printf("Enter the number (1-3):\n");
        scanf("%d",&num);
        switch(num)
        {
            case 1:
                   OS_Solaris_print();
                   break;
            case 2:
                   OS_Windows_print();
                   break;
            case 3:
                   OS_HP-UX_print();
                   break;
            default:
                   printf("Hmm! only 1-3 :-)\n");
                   break;
        }
}

Output :

case 3:
                        OS_HP-UX_print();
                        break

1. OS_HP-UX_Print i not valid Identifier ( Function name )
2. It has dash (-) in between.

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Tags / Keywords : | mcq : switch case

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