Tax calculation based on United States Federal Tax Schedule - C Operator

C examples for Operator:Arithmetic Operator

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Introduction

United States Federal Tax Schedule had four categories, and each category had two rates.

Category Tax
Single 15% of first $17,850 plus 28% of excess
Head of Household 15% of first $23,900 plus 28% of excess
Married, Joint 15% of first $29,750 plus 28% of excess
Married, Separate 15% of first $14,875 plus 28% of excess

Demo Code

   
#include <stdio.h>

#define SINGLE 1// ww w  .  j  a v a2  s .  c  om
#define HEAD_OF_HOUSEHOLD 2
#define MARRIED_JOINT 3
#define MARRIED_SEPARATE 4
#define EXIT 5

#define RATE_1 0.15f
#define RATE_2 0.28f

void flush_input_buffer(void);

int main(void){
  int category;
  float income, bracket, taxes;

  while(1){
    printf("1) Single  2) Head of Household  3) Married, Joint  4) Married Separate\n");
    printf("Enter your tax category (1-4) or 5 to quit: ");
    scanf("%d", &category);

    switch (category)
    {
      case (SINGLE) :  
          bracket = 17850.0;
          break;
      case (HEAD_OF_HOUSEHOLD) :
          bracket = 23900.0;
          break;
      case (MARRIED_JOINT) :
          bracket = 29750.0;
          break;
      case (MARRIED_SEPARATE) :
          bracket = 14875.0;
          break;
      case (EXIT) : 
          printf("Bye.\n");
          return 0; // Exit Program
      default :
          flush_input_buffer();
          printf("Invalid input: please enter an integer between 1 and 5.\n");
          continue;
    }
    printf("Enter your income: ");
    while (scanf("%f", &income) != 1 || income < 0)
    {
      flush_input_buffer();
      printf("Invalid input: please enter a positive number.\n");
      printf("Enter your income: ");
    }

    if (income > bracket)
      taxes = RATE_2 * (income - bracket) + RATE_1 * bracket;
    else
      taxes = RATE_1 * income;

    printf("You will owe $%.2f in taxes.\n\n", taxes);
  }
}

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

Result


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