#include<stdio.h>
main()
{
int i=1,j=2;
switch(i)
{
case 1: printf("GOOD");
break;
case j: printf("BAD");
break;
}
}


Answer:
Compiler Error: Constant expression required in function main.


Explanation:
The case statement can have only constant expressions (this implies that we cannot use variable names directly so an error).

Note:
Enumerated types can be used in case statements.