Question

Use C++, Modify the content so that it produces the required output.  

/*
Program uses the cost of a meal to determine the total amount paid given 6% sales tax and a 20% tip
*/

// DEFINE THE FOLLOWING FUNCTIONS. Use the information provided for each function to determine
// the function header and the function body.

// return type: float
// Parameters: none
// Purpose: This function prompts the user for the cost of a meal, validates it and returns it.
// Input validation: The cost of the meal should be at least 0.
GetMealCost() {

}

// return type: float
// Parameters: float (mealCost)
// Purpose: This function calculates and returns 6% of the meal cost.
CalculateTax(mealCost) {

}

// return type: float
// Parameters: float (mealCost)
// Purpose: This function calculates and returns 20% of the meal cost.
CalculateTip(mealCost) {

}

// return type: float
// Parameters: 3 floats(mealCost, tax, tip)
// This function calculates and returns the total cost of the meal
CalculateTotalCost(mealCost, tax, tip) {

}

// return type: none
// Parameters: 4 floats(mealCost, tax, tip, total)
// This function displays a receipt as follows:
// Meal Receipt
// *****************
// Meal Cost: $20.00
// Tax: $1.20
// Tip: $4.00
// Total: $25.40
DisplayReceipt(mealCost, tax, tip, total) {

}

int main() {
// declare and initialize variables
float mycost, mytax, mytip, mytotal;
mycost = mytax = mytip = mytotal = 0.0;
  

// call a function to prompt for a meal cost and store the result in mycost
  

  
// call a function to calculate the tax for the meal and store the result in mytax
  

// call a function to calculate the tip for the meal and store the result in mytip
  

// call a function to calculate the total cost of the meal and store the result in mytotal
  

  
// invoke a function to display the receipt for the meal

Answer 1

#include <iostream>
using namespace std;

// DEFINE THE FOLLOWING FUNCTIONS. Use the information provided for each function to determine
// the function header and the function body.

// return type: float
// Parameters: none
// Purpose: This function prompts the user for the cost of a meal, validates it and returns it.
// Input validation: The cost of the meal should be at least 0.
float GetMealCost()
{
// To store meal cost
float mealCost;

// Loops till valid meal cost entered by the user
do
{
// Accepts meal cost
cout<<"\n Enter meal cost: ";
cin>>mealCost;

// Checks if meal cost is less than 0 then display error message
// and asks again
if(mealCost < 0)
cout<<"\n The cost of the meal should be at least 0. \n Try again.";

// Otherwise valid meal cost. Return the cost
else
return mealCost;
}while(1);// End of do - while loop
}// End of function

// return type: float
// Parameters: float (mealCost)
// Purpose: This function calculates and returns 6% of the meal cost.
float CalculateTax(float mealCost)
{
return (mealCost * 0.06);
}// End of function

// return type: float
// Parameters: float (mealCost)
// Purpose: This function calculates and returns 20% of the meal cost.
float CalculateTip(float mealCost)
{
return (mealCost * 0.2);
}// End of function

// return type: float
// Parameters: 3 floats(mealCost, tax, tip)
// This function calculates and returns the total cost of the meal
float CalculateTotalCost(float mealCost, float tax, float tip)
{
return (mealCost + tax + tip);
}// End of function

// return type: none
// Parameters: 4 floats(mealCost, tax, tip, total)
// This function displays a receipt as follows:
// Meal Receipt
// *****************
// Meal Cost: $20.00
// Tax: $1.20
// Tip: $4.00
// Total: $25.40
void DisplayReceipt(float mealCost, float tax, float tip, float total)
{
cout<<"\n\n Meal Receipt";
cout<<"\n *****************";
cout<<"\n Meal Cost: $"<<mealCost;
cout<<"\n Tax: $"<<tax;
cout<<"\n Tip: $"<<tip;
cout<<"\n Total: $"<<total;
}// End of function

// main function definition
int main()
{
// declare and initialize variables
float mycost, mytax, mytip, mytotal;
mycost = mytax = mytip = mytotal = 0.0;

// Calls the function to prompt for a meal cost and store the result in mycost
mycost = GetMealCost();

// Call the function to calculate the tax for the meal and store the result in mytax
mytax = CalculateTax(mycost);

// Call the function to calculate the tip for the meal and store the result in mytip
mytip =CalculateTip(mycost);

// Call the function to calculate the total cost of the meal and store the result in mytotal
mytotal = CalculateTotalCost(mycost, mytax, mytip);

// Calls the function to display the receipt for the meal
DisplayReceipt(mycost, mytax, mytip, mytotal);
return 0;
}// End of main function

Sample Output:

Enter meal cost: -12

The cost of the meal should be at least 0.
Try again.
Enter meal cost: 100

Meal Receipt
*****************
Meal Cost: $100
Tax: $6
Tip: $20
Total: $126