CFunctions

include<stdio.h>
//float price, tax, appleCareCharge, subtotal, total; // used float to store decimals
float computeAppleCareCharges(int y, float p);
float computeAppleSubtotal(float c, float p);
float computeTax(float s);
float computeTotalCharges(float s, float t);

int main (void)
{
    //variable declorations
    int years;
    char brand;
    float price = 0.0,
          subtotal = 0.0,
          tax = 0.0,
          total = 0.0;

    printf("Enter the price of the phone: ");   //prompt user for price
    scanf("%f", &price);                        // assigns price a value
    scanf("%c", &brand);                        // remove new line
    printf("Is the phone an iPhone (Y/N)?  ");  //prompts on brand of phone
    scanf("%c", &brand);                        //store case variable "brand"

    switch (brand)  //switch to choose answer to brand
    {
        case 'Y':
        case 'y':
            {
            printf("Enter the number of years of AppleCare: ");   // get applecare variable
            scanf("%i", &years);

            float charge = computeAppleCareCharges(years, price);
            subtotal = computeAppleSubtotal(charge, price);
            tax = computeTax(subtotal);
            total = computeTotalCharges(subtotal, tax);
            printf("\nPrice of the phone: $%.2f\nAppleCare price: $%.2f\nSubtotal: $%.2f\nTax (5%%): $%.2f\nTotal Price: $%.2f",price, charge, subtotal, tax, total);

            break;
            }

        case 'N':
        case 'n':
            {
            tax = computeTax(price);
            total = computeTotalCharges(price, tax);
            printf("\nPrice of the phone: $%.2f \nThe tax is: $%.2f \nThe Total is: $%.2f",price,tax,total);
            break;
            }
    }

    return (0);     // All C programs need this at the end of main
}

float computeAppleCareCharges(int years, float price)
{
    float appleCareCharge = 0.0;
    if (years == 1 )
        appleCareCharge = (price * .12); //code included to compute variables and totals for iPhone w/ 1 year AppleCare, and display results
    else {
        if (years > 1)                              //code included to compute variables and totals for iPhone w/ >1 year AppleCare, and display results
            appleCareCharge = (price * .1) * years;
        else
            printf("You must have at least one year of AppleCare, please start again.");
    }
    return appleCareCharge;
}

float computeAppleSubtotal(float appleCareCharge, float price)
{
        float subtotal = appleCareCharge + price;
        return subtotal;
}

float computeTax(float subtotal)
{
        return (subtotal * .5);
}

float computeTotalCharges(float subtotal, float tax)
{
        return (subtotal + tax);
}