Thread: Need help creating functions for school project

Code:

#include <iomanip>
#include <cmath>
#include <iostream>
#include <string>
#include <fstream>
const float TAX = .07, TIPS = .15, DESERT = 4.50, CHILD_RATE = .6;




using namespace std;


int main()
{ string name;
    float cost_adult, room_fee, deposit;
    int num_adults, num_children, num_desert;
    //input section
    cout << "What is your name? : ";
    getline(cin,name);
    cout << "How many adults will be served? : "; cin >> num_adults;
    cout << "How many children will be served? : "; cin >> num_children;
    cout << "How many pieces of dessert will you need? : "; cin >> num_desert;
    cout << "What is the cost per adult meal? : "; cin >> cost_adult;
    cout << "What is your room fee? : "; cin >> room_fee;
    cout << "What is the amouunt of deposit paid when the reservation was made? : "; cin >> deposit;
    
    //proccessing section
    float cost_child, total_cost_adult, total_cost_child, total_cost_desert, total_cost_food, taxes, total_bill, balance_due, tips;
    
    cost_child = CHILD_RATE * cost_adult;
    total_cost_adult = cost_adult * num_adults;
    total_cost_child = cost_child * num_children;
    total_cost_desert = DESERT * num_desert;
    total_cost_food = total_cost_adult + total_cost_child + total_cost_desert;
    taxes = total_cost_food * TAX;
    tips = total_cost_food * TIPS;
    total_bill = total_cost_food + taxes + tips;
    balance_due = total_bill - deposit;
    
    void output()
    {
    
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    cout<< '\n'<<setw(18);
    cout<< "Passaic County Catering & Convention Services   Final Bill"<<endl;
    cout<< '\n'<<setw(4)<<"Customer: "<<"\t\t\t\t\t\t"<<name;
    cout<< '\n'<<setw(4)<<"Number of Adults:"<<"\t\t\t\t$"<<num_adults;
    cout<< '\n'<<setw(4)<<"Number of Children:"<<"\t\t\t\t$"<<num_children;
    cout<< '\n'<<'\n'<<setw(4)<<"Cost of Meal Per Adult:"<<"\t\t\t$"<<cost_adult;
    cout<< '\n'<<setw(4)<<"Cost Of Child's Meal Per Adult:"<<setprecision (2)<<fixed<<"\t$"<<cost_child;
    cout<< '\n'<<setw(4)<<"Total Cost for Desert:"<<"\t\t\t$"<<total_cost_desert;
    cout<< '\n'<<setw(4)<<"Total Food Cost:"<<"\t\t\t\t$"<<total_cost_food;
    cout<< '\n'<<'\n'<<setw(4)<<"Plus 7.5 % Taxes:"<<"\t\t\t\t$"<<taxes;
    cout<< '\n'<<setw(4)<<"Plus 15.0 % Tips:"<<"\t\t\t\t$"<<tips;
    cout<< '\n'<<setw(4)<<"Plus Room Fee:"<<"\t\t\t\t\t$"<<room_fee;
    cout<< '\n'<<'\n'<<setw(4)<<"Total Bill:"<<"\t\t\t\t\t\t$"<<total_bill;
    cout<< '\n'<<setw(4)<<"Less Deposit:"<<"\t\t\t\t\t$"<<deposit;
    cout<< '\n'<<'\n'<<setw(4)<<"Balance Due:"<<"\t\t\t\t\t$"<<balance_due;
    cout<< '\n'<<'\n'<<setw(18)<<"Thank You For Using Passaic County Catering Services."<<endl;
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    }


    
    return 0;
}

That's my program so far and it works well except I want to change the group of statements under input section, processing section, and output section into functions. I tried putting making a prototype with output but I just have no clue what to do to make it into a separate functions that I can call in main.

Since this is C++ your program should not work at all. In C++ you can't implement functions inside other functions.

Jim

You could skip the output() function and do this instead to make the C++ syntax correct.

Code:

#include <iomanip>
#include <cmath>
#include <iostream>
#include <string>
#include <fstream>
const float TAX = .07, TIPS = .15, DESERT = 4.50, CHILD_RATE = .6;
 
 
 
 
using namespace std;
 
 
int main()
{ 
	string name;
    float cost_adult, room_fee, deposit;
    int num_adults, num_children, num_desert;
    
    //input section
    cout << "What is your name? : ";
    getline(cin,name);
    cout << "How many adults will be served? : "; cin >> num_adults;
    cout << "How many children will be served? : "; cin >> num_children;
    cout << "How many pieces of dessert will you need? : "; cin >> num_desert;
    cout << "What is the cost per adult meal? : "; cin >> cost_adult;
    cout << "What is your room fee? : "; cin >> room_fee;
    cout << "What is the amouunt of deposit paid when the reservation was made? : "; cin >> deposit;
     
    //proccessing section
    float cost_child, total_cost_adult, total_cost_child, total_cost_desert, total_cost_food, taxes, total_bill, balance_due, tips;
     
    cost_child 			= CHILD_RATE * cost_adult;
    total_cost_adult 	= cost_adult * num_adults;
    total_cost_child 	= cost_child * num_children;
    total_cost_desert 	= DESERT * num_desert;
    total_cost_food  	= total_cost_adult + total_cost_child + total_cost_desert;
    taxes 				= total_cost_food * TAX;
    tips				= total_cost_food * TIPS;
    total_bill 			= total_cost_food + taxes + tips;
    balance_due 		= total_bill - deposit;
     


    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    cout<< '\n'<<setw(18);
    cout<< "Passaic County Catering & Convention Services   Final Bill"<<endl;
    cout<< '\n'<<setw(4)<<"Customer: "<<"\t\t\t\t\t\t"<<name;
    cout<< '\n'<<setw(4)<<"Number of Adults:"<<"\t\t\t\t$"<<num_adults;
    cout<< '\n'<<setw(4)<<"Number of Children:"<<"\t\t\t\t$"<<num_children;
    cout<< '\n'<<'\n'<<setw(4)<<"Cost of Meal Per Adult:"<<"\t\t\t$"<<cost_adult;
    cout<< '\n'<<setw(4)<<"Cost Of Child's Meal Per Adult:"<<setprecision (2)<<fixed<<"\t$"<<cost_child;
    cout<< '\n'<<setw(4)<<"Total Cost for Desert:"<<"\t\t\t$"<<total_cost_desert;
    cout<< '\n'<<setw(4)<<"Total Food Cost:"<<"\t\t\t\t$"<<total_cost_food;
    cout<< '\n'<<'\n'<<setw(4)<<"Plus 7.5 % Taxes:"<<"\t\t\t\t$"<<taxes;
    cout<< '\n'<<setw(4)<<"Plus 15.0 % Tips:"<<"\t\t\t\t$"<<tips;
    cout<< '\n'<<setw(4)<<"Plus Room Fee:"<<"\t\t\t\t\t$"<<room_fee;
    cout<< '\n'<<'\n'<<setw(4)<<"Total Bill:"<<"\t\t\t\t\t\t$"<<total_bill;
    cout<< '\n'<<setw(4)<<"Less Deposit:"<<"\t\t\t\t\t$"<<deposit;
    cout<< '\n'<<'\n'<<setw(4)<<"Balance Due:"<<"\t\t\t\t\t$"<<balance_due;
    cout<< '\n'<<'\n'<<setw(18)<<"Thank You For Using Passaic County Catering Services."<<endl;
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
 
     
    return 0;
}

Otherwise you have to implement a function outside of the main()-function block.
Then you could let the output()-function do most of the tasks.

Code:

#include <iomanip>
#include <cmath>
#include <iostream>
#include <string>
#include <fstream>
const float TAX = .07, TIPS = .15, DESERT = 4.50, CHILD_RATE = .6;
 
 
 
 
using namespace std;
 
void output(); 
 
int main()
{
	output(); 
    return 0;
}


void output()
    {
    string name; 
    float cost_adult, room_fee, deposit;
    int num_adults, num_children, num_desert;
    
    //input section
    cout << "What is your name? : ";
    getline(cin,name);
    cout << "How many adults will be served? : "; cin >> num_adults;
    cout << "How many children will be served? : "; cin >> num_children;
    cout << "How many pieces of dessert will you need? : "; cin >> num_desert;
    cout << "What is the cost per adult meal? : "; cin >> cost_adult;
    cout << "What is your room fee? : "; cin >> room_fee;
    cout << "What is the amouunt of deposit paid when the reservation was made? : "; cin >> deposit;
    
    //proccessing section
    float cost_child, total_cost_adult, total_cost_child, total_cost_desert, total_cost_food, taxes, total_bill, balance_due, tips;
    
    cost_child 			= CHILD_RATE * cost_adult;
    total_cost_adult 	= cost_adult * num_adults;
    total_cost_child 	= cost_child * num_children;
    total_cost_desert 	= DESERT * num_desert;
    total_cost_food  	= total_cost_adult + total_cost_child + total_cost_desert;
    taxes 				= total_cost_food * TAX;
    tips				= total_cost_food * TIPS;
    total_bill 			= total_cost_food + taxes + tips;
    balance_due 		= total_bill - deposit;
    
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    cout<< '\n'<<setw(18);
    cout<< "Passaic County Catering & Convention Services   Final Bill"<<endl;
    cout<< '\n'<<setw(4)<<"Customer: "<<"\t\t\t\t\t\t"<<name;
    cout<< '\n'<<setw(4)<<"Number of Adults:"<<"\t\t\t\t$"<<num_adults;
    cout<< '\n'<<setw(4)<<"Number of Children:"<<"\t\t\t\t$"<<num_children;
    cout<< '\n'<<'\n'<<setw(4)<<"Cost of Meal Per Adult:"<<"\t\t\t$"<<cost_adult;
    cout<< '\n'<<setw(4)<<"Cost Of Child's Meal Per Adult:"<<setprecision (2)<<fixed<<"\t$"<<cost_child;
    cout<< '\n'<<setw(4)<<"Total Cost for Desert:"<<"\t\t\t$"<<total_cost_desert;
    cout<< '\n'<<setw(4)<<"Total Food Cost:"<<"\t\t\t\t$"<<total_cost_food;
    cout<< '\n'<<'\n'<<setw(4)<<"Plus 7.5 % Taxes:"<<"\t\t\t\t$"<<taxes;
    cout<< '\n'<<setw(4)<<"Plus 15.0 % Tips:"<<"\t\t\t\t$"<<tips;
    cout<< '\n'<<setw(4)<<"Plus Room Fee:"<<"\t\t\t\t\t$"<<room_fee;
    cout<< '\n'<<'\n'<<setw(4)<<"Total Bill:"<<"\t\t\t\t\t\t$"<<total_bill;
    cout<< '\n'<<setw(4)<<"Less Deposit:"<<"\t\t\t\t\t$"<<deposit;
    cout<< '\n'<<'\n'<<setw(4)<<"Balance Due:"<<"\t\t\t\t\t$"<<balance_due;
    cout<< '\n'<<'\n'<<setw(18)<<"Thank You For Using Passaic County Catering Services."<<endl;
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    }

You could create an input and output function if you want to have the input and output in separated
parts. It's your choice.

Here's one idea using reference parameters of how you could make the input() and output() function at least.

Code:

#include <iomanip>
#include <cmath>
#include <iostream>
#include <string>
#include <fstream>
const float TAX = .07, TIPS = .15, DESERT = 4.50, CHILD_RATE = .6;
 
 
 
 
using namespace std;
 
void output(string& name, float& cost_adult, float& room_fee, 
			float& deposit, int& num_adults, int& num_children, int& num_desert); 
void input();
 
int main()
{
	input();
    return 0;
}


void input() {
    string name; 
    float cost_adult, room_fee, deposit;
    int num_adults, num_children, num_desert;
    
    //input section
    cout << "What is your name? : ";
    getline(cin,name);
    cout << "How many adults will be served? : "; cin >> num_adults;
    cout << "How many children will be served? : "; cin >> num_children;
    cout << "How many pieces of dessert will you need? : "; cin >> num_desert;
    cout << "What is the cost per adult meal? : "; cin >> cost_adult;
    cout << "What is your room fee? : "; cin >> room_fee;
    cout << "What is the amouunt of deposit paid when the reservation was made? : "; cin >> deposit;
    output(name, cost_adult, room_fee, deposit, num_adults, num_children, num_desert);
}


void output(string& name, float& cost_adult, float& room_fee, 
			float& deposit, int& num_adults, int& num_children, int& num_desert)
    {


    
    //proccessing section
    float cost_child, total_cost_adult, total_cost_child, total_cost_desert, total_cost_food, taxes, total_bill, balance_due, tips;
    
    cost_child 			= CHILD_RATE * cost_adult;
    total_cost_adult 	= cost_adult * num_adults;
    total_cost_child 	= cost_child * num_children;
    total_cost_desert 	= DESERT * num_desert;
    total_cost_food  	= total_cost_adult + total_cost_child + total_cost_desert;
    taxes 				= total_cost_food * TAX;
    tips				= total_cost_food * TIPS;
    total_bill 			= total_cost_food + taxes + tips;
    balance_due 		= total_bill - deposit;
    
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    cout<< '\n'<<setw(18);
    cout<< "Passaic County Catering & Convention Services   Final Bill"<<endl;
    cout<< '\n'<<setw(4)<<"Customer: "<<"\t\t\t\t\t\t"<<name;
    cout<< '\n'<<setw(4)<<"Number of Adults:"<<"\t\t\t\t$"<<num_adults;
    cout<< '\n'<<setw(4)<<"Number of Children:"<<"\t\t\t\t$"<<num_children;
    cout<< '\n'<<'\n'<<setw(4)<<"Cost of Meal Per Adult:"<<"\t\t\t$"<<cost_adult;
    cout<< '\n'<<setw(4)<<"Cost Of Child's Meal Per Adult:"<<setprecision (2)<<fixed<<"\t$"<<cost_child;
    cout<< '\n'<<setw(4)<<"Total Cost for Desert:"<<"\t\t\t$"<<total_cost_desert;
    cout<< '\n'<<setw(4)<<"Total Food Cost:"<<"\t\t\t\t$"<<total_cost_food;
    cout<< '\n'<<'\n'<<setw(4)<<"Plus 7.5 % Taxes:"<<"\t\t\t\t$"<<taxes;
    cout<< '\n'<<setw(4)<<"Plus 15.0 % Tips:"<<"\t\t\t\t$"<<tips;
    cout<< '\n'<<setw(4)<<"Plus Room Fee:"<<"\t\t\t\t\t$"<<room_fee;
    cout<< '\n'<<'\n'<<setw(4)<<"Total Bill:"<<"\t\t\t\t\t\t$"<<total_bill;
    cout<< '\n'<<setw(4)<<"Less Deposit:"<<"\t\t\t\t\t$"<<deposit;
    cout<< '\n'<<'\n'<<setw(4)<<"Balance Due:"<<"\t\t\t\t\t$"<<balance_due;
    cout<< '\n'<<'\n'<<setw(18)<<"Thank You For Using Passaic County Catering Services."<<endl;
    cout<< setfill('-')<<setw(80)<<"-"<<endl;
    }