Warning "warning: statement with no effect" and "wunused" value

I typed a program in C using the switch control expression. This is to determine if an integer is odd or even, and I keep getting this warning in Code::Blocks in the lines with "num % 2 == 0;" and "num % 2 != 0;".

warning: statement with no effect [-Wunused-value]|

I have tried to google the issue, but each solution appears vague, like one stated that the problem lies with assigning a value to the result.

The program is below:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num;

    printf("Enter the integer\n");
    scanf("%d", &num);

    switch(num % 2)
    {
        case 0:
            num % 2 == 0;
            printf("Number is even");
            break;

        case 1:
            num % 2 != 0;
            printf("Number is odd");
            break;
    }

    Return 0;
 }

It means exactly what your compiler tells you: The statements

num % 2 != 0;

and

num % 2 == 0;

do not have an effect and can be removed. These are comparisons, but the comparison result is not used (i.e. discarded).

The conditional is already here:

switch(num % 2)

and the result is used with the case statements.

Maybe the statements without any effect were meant to be comments? Then prefix them with //.