Switch in C programming [duplicate]

Answer 1

case statements need constants. You could accomplish something similar to what you're doing with a macro.

#define TEN 10
#include
int main()
{
int const  x = TEN;
int y = 20;
switch(y)
{
    case TEN:      //error: case label does not reduce to an integer constant
    printf("value of x: %d\n",x);   
    break;
}
}