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Changeing Program to be written with functions

I am having trouble even understanding where to start on this. I am supposed to rewrite my little tax program using Functions. Any and all help would be appreciated. I use the util.h to help me with my error correction. I tried to upload it but it is blocked.

//Author: David E. Berry
//Date: 21 May 2009, 
//Revision: 3.0.2, This version checks for only positive numbers for the sale amount
//
 
#include <stdio.h>
#include "util.h"
 
int main(int argc, char *argv[])
 
 
{
char buff[25];
int choice = 0;
char answer;
 
char input[BUFSIZ], *p;
 
double iAmountofSale; /* Represents a double precision floating point data type*/ 
  
//Section for numbers to plug into equations
 
  float iDelMarTaxRate = 0.0725;
  float iEncinitasTaxRate = 0.075;
  float iLaJollaTaxRate = 0.0775;
  float iTax_Result_DelMar = 0;
  float iTax_Result_Encinitas = 0;
  float iTax_Result_LaJolla = 0;
  float iTotal_Result_DelMar = 0;
  float iTotal_Result_Encinitas = 0;
  float iTotal_Result_LaJolla = 0;
 
//Section to choose store for Intro Text
 
 
do {   /*Starts Main loop*/
    while (choice <= 0 || choice > 4){ /*Takes only a valid menu user input*/
      system("CLS");
      printf("\n\tKudler Fine Foods Sales Tax and Total Calculation Program\n");
      printf("\n\tversion 3.0.2  Author: David E. Berry\n");
      printf("===============================================================\n");
      printf("\Sales Tax per Store location and Sales Total for that location\n\n");
      printf("\t1. DelMar\n");
      printf("\t2. Encinitas\n");
      printf("\t3. LaJolla\n");
      printf("\t4. to quit program\n");
      printf("\nEnter a number for the store of your choice: ");
      scanf("%s", buff);
      if ( !isAnumber(buff))continue; /*Continues with the loop*/
      choice = atoi(buff);  /*Converts choice input into an integer*/
      if ( choice == 4) exit(0); /*If the user choice is 4 the program quits*/
    }
 
 
//Error handling section to ensure postive interger for input
 
    
  printf("Enter purchase amount: $");
     
 
     for(;;)
     {        /* Infinite "for" loop until the user enters a postive number */
 
		fgets(input , sizeof(input), stdin);
 
		iAmountofSale = strtod(input , &p); /*This is the amount used in the calulation of the tax and total*/
 
		if(input[0] != '\n' && iAmountofSale > 0 && (*p == '\n' || *p == '\0')) break; /*This checks for only positive numbers*/
		
		else printf("Invalid input!\n\nPlease enter a positive integer for the amount: $"); /*Displays if the user did not enter a postive number*/
 
		iAmountofSale = 0;
 
      }
					
   printf("\nYou've entered the amount: $%.2f\n", iAmountofSale); /*Displays the number user input correctly*/    
    
    
    
    switch (choice) /*Takes you to the proper Case*/
         
    { 
 
    case 1:
 
        iTax_Result_DelMar = iAmountofSale * iDelMarTaxRate;  /*Does the math for DelMar Tax*/
        printf("\nSales Tax for Del Mar is $%.2f\n", iTax_Result_DelMar);
        iTotal_Result_DelMar = iAmountofSale + iTax_Result_DelMar; /*Figures the total Sale for DelMar*/
        printf("\nTotal Sale for Del Mar is $%.2f\n\n", iTotal_Result_DelMar);
        
    break;
        
    case 2:
       
        iTax_Result_Encinitas = iAmountofSale * iEncinitasTaxRate; /*Does the math for Encinitas Tax*/
        printf("\nSales Tax for Encinitas is $%.2f\n\n", iTax_Result_Encinitas); //add an \n
        iTotal_Result_Encinitas = iAmountofSale + iTax_Result_Encinitas; /*Figures the total Sale for Encinitas*/
        printf("Total Sale for Encinitas is $%.2f\n\n", iTotal_Result_Encinitas);
 
    break;     
 
    case 3:
 
       iTax_Result_LaJolla = iAmountofSale * iLaJollaTaxRate; /*Does the math for LaJolla Tax*/
       printf("\nSales for Tax La Jolla is $%.2f\n\n", iTax_Result_LaJolla);
       iTotal_Result_LaJolla = iAmountofSale + iTax_Result_LaJolla; /*Figures the total Sale for LaJolla*/
       printf("Total Sale for La Jolla is $%.2f\n\n", iTotal_Result_LaJolla);
 
    }    
 
      printf("\nWould you like to try again (y,n)? "); /*Gives the user another chance to run the program from the start*/
      choice = 0;
      answer = getchar(); 
    } while('y' == answer || 'Y' == answer); 
 
  
  return 0;
}

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a_b

isAnumber is not defined. - Error

SOLUTION

mrjoltcola

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mrjoltcola

I assume isAnumber is part of util.h as the OP suggested, but the point here is not to fix the program for him, as this is obviously homework. Please make sure to read the homework rules in the help section.

mrjoltcola

Sorry for the double talk up there, I had a "cut-and-paste" error before submitting. :)

SOLUTION

evilrix

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