Presents a menu of pay rates from which to choose.

Introduction

Use a switch to select the pay rate.

The beginning of a run should look something like this:

Enter the number corresponding to the desired pay rate or action:

$8.75/hr
$9.33/hr
$10.00/hr
$11.20/hr
quit

If choices 1 through 4 are selected, the program should request the hours worked.

The program should recycle until 5 is entered.

If something other than choices 1 through 5 is entered, the program should remind the user what the proper choices are and then recycle.

Demo Code

#include <stdio.h>
#include <stdbool.h>

#define RATE_1 8.75//from w ww  .  j ava  2  s .  com
#define RATE_2 9.33
#define RATE_3 10.00
#define RATE_4 11.20

#define OVERTIME_HOURS 40.0
#define OVERTIME_MULTIPLIER 1.5
#define TAX_RATE_1 0.15
#define TAX_BRACKET_1 300.0
#define TAX_RATE_2 0.20
#define TAX_BRACKET_2 450.0
#define TAX_RATE_3 0.25

void flush_input_buffer(void);
float calculate_gross_pay(float hours, float rate);
float calulate_taxes(float gross_pay);

int main(void){
  bool exit_flag = false;
  int rate_option;
  float rate, hours, gross_pay, taxes;

  while (1){
    printf("Enter the number corresponding to the desired pay rate or action:\n");
    printf("1) $%.2f/hr         2) $%.2f/hr\n", RATE_1, RATE_2);
    printf("3) $%.2f/hr         4) $%.2f/hr\n", RATE_3, RATE_4);
    printf("5) quit \n");

    scanf("%d", &rate_option);
    switch (rate_option){
      case (1) :   
        rate = RATE_1;
        break;
      case (2) :   
        rate = RATE_2;
        break;
      case (3) :
        rate = RATE_3;
        break;
      case (4) :
        rate = RATE_4;
        break;
      case (5) :
        exit_flag = true;
        break;
      default : // invalid input
        flush_input_buffer();
        printf("Please enter an integer between 1 and 5.\n\n");
        continue; // repeat main program loop
    }

    if (exit_flag)
      break; // exit program

    printf("Enter number of hours worked in a week: ");
    
    while (scanf("%f", &hours) != 1 || hours <= 0){
      flush_input_buffer();
      printf("Enter number of hours worked in a week: ");
    }

    gross_pay = calculate_gross_pay(hours, rate);
    taxes = calulate_taxes(gross_pay);

    printf("For %.1f hours of work at $%.2f/hr, you make $%.2f and pay $%.2f in taxes.\n", hours, rate, gross_pay, taxes);
    printf("\n");
  }
  return 0;
}

void flush_input_buffer(void){
  while (getchar() != '\n')
    ;
}

float calculate_gross_pay(float hours, float rate){
  if (hours > OVERTIME_HOURS)
    return OVERTIME_HOURS * rate + (hours - OVERTIME_HOURS) * rate * OVERTIME_MULTIPLIER;
  else
    return hours * rate;
}

float calulate_taxes(float gross_pay)
{
  if (gross_pay > TAX_BRACKET_2)
    return TAX_RATE_3 * (gross_pay - TAX_BRACKET_2) + TAX_RATE_2 * (TAX_BRACKET_2 - TAX_BRACKET_1) + TAX_RATE_1 * TAX_BRACKET_1;
  else if (gross_pay > TAX_BRACKET_1)
    return TAX_RATE_2 * (gross_pay - TAX_BRACKET_1) + TAX_RATE_1 * TAX_BRACKET_1;
  else
    return TAX_RATE_1 * gross_pay;
}

Presents a menu of pay rates from which to choose. - C Operator

Introduction

Demo Code

Result

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