Thread: Having trouble with while loop

I'm still a noon trying to teach myself C and I'm using the Prada C Primer book to help me along. This program is supposed to have you choose a pay rate then calculate the gross tax and net then display them. It is supposed to exit if a 5 is entered to quit but the loop isn't behaving as I expected. Can someone please explain how and where I went wrong?

Code:

#include <stdio.h>
#include <string.h>
#include <ctype.h>


#define RATE1 .15
#define RATE2 .20
#define RATE3 .25


#define GROSS1 300
#define GROSS2 450


#define TAX1 (GROSS1 * RATE1)
#define TAX2 (TAX1 + (RATE2 * (gross - GROSS1)))
#define TAX3 (TAX1 + TAX2 + (RATE3 * (gross - GROSS2)))


#define WAGE1 8.75
#define WAGE2 9.33
#define WAGE3 10.00
#define WAGE4 11.20


int pay_Rate;
float hourz, gross, net, tax, wage;


int main(int argc, const char **argv)
{
    printf("*****************************************************************\n");
    printf("Enter the number corresponding to the desired pay rate or action:\n");
    printf("1) $8.75                            2) $9.33\n");
    printf("3) $10.00                           4) $11.20\n");
    printf("5) quit\n");
    printf("*****************************************************************\n");
    
    while((scanf("%d", &pay_Rate) > 0) || (scanf("%d", &pay_Rate) < 5) || (scanf("%d", &pay_Rate) != 5))
    {
        scanf("%d", &pay_Rate);
        
        switch(pay_Rate)
        {
            case 1:
                wage = WAGE1;
                break;
        
            case 2:
                wage = WAGE2;
                break;
        
            case 3:
                wage = WAGE3;
                break;
        
            case 4:
                wage = WAGE4;
                break;
        
            case 5:
                printf("quit\n");
                continue;
        
            default:
                printf("you entered an invalid number.\n");
                printf("Enter a valid number.\n");
                continue;
        }
    
        printf("\nNumber of hourz worked this week: ");
        scanf("%f", &hourz);
    
        if(hourz > 40)
            gross = ((hourz - 40) * (1.5 * wage)) + (40 * wage);
        else
            gross = hourz * wage;
    
        if(gross <= GROSS1)
            tax = RATE1 * gross;
    
        else if(gross <= GROSS2)
            tax = TAX2;
    
        else
            tax = TAX3;
    
        net = gross - tax;
    
        printf("gross is %.2f minus tax %.2f is a net of %.2f.\n", gross, tax, net);
        printf("\nEnter another pay rate: ");
    }
    printf("end of run");    
    
    return 0;
}

Thank you @Salem! That did the trick. That was a complete brainfart!