Thread: Problem with a switch statement.

This is a switch statement that works with a float variable. I am trying to discover why it is allowed to work. I can think of only three answers:

1. Float isn't really float.
2. It figures the value out within the parameters defined with round-off.
3. The compiler is in error.

Code:

# include <stdio.h>

int main () {

float x;

printf("Enter a number: ");
scanf("%f", &x);

if (x < 0)
 {
       printf("Please use a postive number.");
       return 1;
 }

switch(0 <= x && x <= 10)
 {
 case 1:
       printf("OK");
       break;
 default: printf("hi"); break;
 }

return 0;

}

Thanks for any help with this. It has been bothering me quite a bit.

Your switch expression evaluates to bool -> integeral type
Kurt

Code:

0 <= x && x <= 10

This results in a boolean value which C treats as an integer 0 or 1. So basically your switch only operates as a if / else.

Thank you very much for the quick replies and explanations.