Question

7.26 LAB: Nutritional information (classes/constructors)

Given main(), complete the FoodItem class (in files FoodItem.h and FoodItem.cpp) with constructors to initialize each food item. The default constructor should initialize the name to "None" and all other fields to 0.0. The second constructor should have four parameters (food name, grams of fat, grams of carbohydrates, and grams of protein) and should assign each private field with the appropriate parameter value.

Ex: If the input is:

M&M's
10.0
34.0
2.0
1.0

where M&M's is the food name, 10.0 is the grams of fat, 34.0 is the grams of carbohydrates, 2.0 is the grams of protein, and 1.0 is the number of servings, the output is:

Nutritional information per serving of None:
   Fat: 0.00 g
   Carbohydrates: 0.00 g
   Protein: 0.00 g
Number of calories for 1.00 serving(s): 0.00


Nutritional information per serving of M&M's:
   Fat: 10.00 g
   Carbohydrates: 34.00 g
   Protein: 2.00 g
Number of calories for 1.00 serving(s): 234.00

The first FoodItem above is initialized using the default constructor

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Given Code:

main.cpp

#include "FoodItem.h"
#include <stdio.h>
#include <iostream>

using namespace std;

int main(int argc, char* argv[]) {
FoodItem FoodItem1;

string itemName;
double amountFat, amountCarbs, amountProtein;

cin >> itemName;
cin >> amountFat;
cin >> amountCarbs;
cin >> amountProtein;

FoodItem FoodItem2 = FoodItem(itemName, amountFat, amountCarbs, amountProtein);

double numServings;
cin >> numServings;

FoodItem1.PrintInfo();
printf("Number of calories for %.2f serving(s): %.2f\n", numServings,
FoodItem1.GetCalories(numServings));
cout << endl << endl;

FoodItem2.PrintInfo();
printf("Number of calories for %.2f serving(s): %.2f\n", numServings,
FoodItem2.GetCalories(numServings));

return 0;
}

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FoodItem.h

#ifndef FOODITEMH
#define FOODITEMH

#include <string>

using namespace std;

class FoodItem {
public:
// TODO: Declare default constructor

// TODO: Declare second constructor with arguments
// to initialize private data members

string GetName();

double GetFat();

double GetCarbs();

double GetProtein();

double GetCalories(double numServings);

void PrintInfo();

private:
string name;
double fat;
double carbs;
double protein;
};

#endif

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FoodItem.cpp

#include "FoodItem.h"
#include <stdio.h>

// Define default constructor

// Define second constructor with arguments
// to initialize private data members

string FoodItem::GetName() {
return name;
}

double FoodItem::GetFat() {
return fat;
}

double FoodItem::GetCarbs() {
return carbs;
}

double FoodItem::GetProtein() {
return protein;
}

double FoodItem::GetCalories(double numServings) {
// Calorie formula
double calories = ((fat * 9) + (carbs * 4) + (protein * 4)) * numServings;
return calories;
}

void FoodItem::PrintInfo() {
printf("Nutritional information per serving of %s:\n", name.c_str());
printf(" Fat: %.2f g\n", fat);
printf(" Carbohydrates: %.2f g\n", carbs);
printf(" Protein: %.2f g\n", protein);
}

Answer 1

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IF YOU WANT ANY CHANGES REGARDING THE SOLUTION OR IF YOU HAVE ANY PROBLEM REGARDING THE SOLUTION PLEASE COMMENT BELOW.

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CODE TO COPY

main.cpp

#include "FoodItem.h"
#include <stdio.h>
#include <iostream>

using namespace std;

int main(int argc, char* argv[]) {
FoodItem FoodItem1;

string itemName;
double amountFat, amountCarbs, amountProtein;

cin >> itemName;
cin >> amountFat;
cin >> amountCarbs;
cin >> amountProtein;

FoodItem FoodItem2 = FoodItem(itemName, amountFat, amountCarbs, amountProtein);

double numServings;
cin >> numServings;

FoodItem1.PrintInfo();
printf("Number of calories for %.2f serving(s): %.2f\n", numServings,
FoodItem1.GetCalories(numServings));
cout << endl << endl;

FoodItem2.PrintInfo();
printf("Number of calories for %.2f serving(s): %.2f\n", numServings,
FoodItem2.GetCalories(numServings));

return 0;
}

FoodItem.cpp

#include "FoodItem.h"
#include <stdio.h>

FoodItem::FoodItem()
{
   name = "None";
   fat = 0.0;
   carbs = 0.0;
   protein = 0.0;
}

FoodItem::FoodItem(string itemName,double amountFat,double amountCarbs,double amountProtein){
   name = itemName;
   fat = amountFat;
   carbs = amountCarbs;
   protein = amountProtein;
}

string FoodItem::GetName() {
return name;
}

double FoodItem::GetFat() {
return fat;
}

double FoodItem::GetCarbs() {
return carbs;
}

double FoodItem::GetProtein() {
return protein;
}

double FoodItem::GetCalories(double numServings) {
// Calorie formula
double calories = ((fat * 9) + (carbs * 4) + (protein * 4)) * numServings;
return calories;
}

void FoodItem::PrintInfo() {
printf("Nutritional information per serving of %s:\n", name.c_str());
printf(" Fat: %.2f g\n", fat);
printf(" Carbohydrates: %.2f g\n", carbs);
printf(" Protein: %.2f g\n", protein);
}

FoodItem.h

#ifndef FOODITEMH
#define FOODITEMH

#include <string>

using namespace std;

class FoodItem {
public:
   FoodItem();
   FoodItem(string itemName,double amountFat,double amountCarbs,double amountProtein);
  
   string GetName();
   double GetFat();
   double GetCarbs();
   double GetProtein();
   double GetCalories(double numServings);
   void PrintInfo();
private:
   string name;
   double fat;
   double carbs;
   double protein;
};

#endif

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EXPLANATION

IN FoodItem.h

FoodItem();//declaring no argument construtoe

FoodItem(string itemName,double amountFat,double amountCarbs,double amountProtein); // declaring arguments and their datatype along with their name

In FoodItem.cpp

FoodItem::FoodItem() // CREATING DEFINITION TO THE NO ARGUMENT CONSTRUCTOR
{
   name = "None"; // assigning name as NONE
   fat = 0.0; // assigning all other variables as 0.0
   carbs = 0.0;
   protein = 0.0;
}

//creating definition to argumented constructor

FoodItem::FoodItem(string itemName,double amountFat,double amountCarbs,double amountProtein){
   name = itemName; //assigning the name
   fat = amountFat; // assigning the fat
   carbs = amountCarbs; // assigning the carbs
   protein = amountProtein; //assigning the fat
}

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IF YOU HAVE ANY DOUBTS REGARDING THE SOLUTION PLEASE COMMENT BELOW I WILL HELP YOU

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