I was given this file to calculate change, again how do i make my own file into

Question

I was given this file to calculate change, again how do i make my own file into a class so i can include it into this one.

#include <iostream>

#include <string>

#include "my_change_calculator.h"

using namespace std;

int main() {

   string cont = "y";

   double cash = 0, purchase = 0;

   while(cont != "n"){

       //input

       cout << "Enter total bill: ";

       cin >> purchase;

       cout << "Enter cash amount you provide: ";

       cin >> cash;

       //output

       string output = calculateChange(purchase, cash);

       cout << output;

       //loop

       cout << "Continue (y/n)? ";

       cin >> cont;

   }

   return 0;

}

MY File

#include <iostream>
#include <string>
#include <math.h>
#include <sstream>

using namespace std;

int main(){
    double c,p;
    string check="y";
    cout<<"Enter a value :";
    cin>>c;
    while(c!=0 && check!="n"){
       
        cout<<"Enter an amount of purchases made against this amount : ";
        cin>>p;
        if(p>c){
            cout<<"purchases cannot exceed cash value "<<endl;
        }
        else{
   
        double r=c-p;
        cout<<"The remaining change is:"<<r<<endl;
   
        cout<<"Twenty US Dollar Bills: "<<(int)((int)r/20)<<endl;
        r= r-(int)((int)r/20)*20;

        cout<<"Ten US Dollar Bills: "<<(int)((int)r/10)<<endl;
        r= r-(int)((int)r/10)*10;

        cout<<"Five US Dollar Bills: "<<(int)((int)r/5)<<endl;
        r= r-(int)((int)r/5)*5;

        cout<<"One US Dollar Bills: "<<((int)r)<<endl;
        r= r-(int)r;

        double i=r;
        string s;
        string t;
        stringstream out;
        out << i;
        s = out.str();
        t = s.substr(s.find(".")+1);
        int digits=t.length();
        r=(r*pow(10,digits));
        int r1=r;

        cout<<"Fifty US Cents Coins: "<<(int)(r1/50)<<endl;
        r1 = r1-(int)(r1/50)*50;

        cout<<"Twenty-Fifty US Cents Coins: "<<(int)(r1/25)<<endl;
        r1= r1-(int)(r1/25)*25;

        cout<<"Ten US Cents Coins: "<<(int)(r1/10)<<endl;   
        r1 = r1-(int)(r1/10)*10;       

        cout<<"Five US Cents Coins: "<<(int)(r1/5)<<endl;
        r1= r1-(int)(r1/5)*5;

        cout<<"One US Cents Coins: "<<r1<<endl;
        r1= 0;
        cout<<"Continue(y/n)? ";
        cin>>check;
        c=c-p;
           }
    }   
    return 0;
}

Explanation / Answer

#include <iostream>

#include <string>

#include <cmath>

#include <sstream>

using namespace std;

string calculateChange(double p, double c) {

double r = c-p;

string str = "";

str += "The remaining change is: " + to_string(r);

str += " Twenty US Dollar Bills: " + to_string((int)((int)r/20));

r= r-(int)((int)r/20)*20;

str += " Ten US Dollar Bills: " + to_string((int)((int)r/10));

r = r-(int)((int)r/10)*10;

str += " Five US Dollar Bills: " + to_string((int)((int)r/5));

r= r-(int)((int)r/5)*5;

str += " One US Dollar Bills: " + to_string((int)r);

r = r-(int)r;

double i=r;

string s;

string t;

stringstream out;

out << i;

s = out.str();

t = s.substr(s.find(".")+1);

int digits=t.length();

r=(r*pow(10,digits));

int r1=r;

str += " Fifty US Cents Coins: " + to_string((int)(r1/50));

r1 = r1-(int)(r1/50)*50;

str += " Twenty-Fifty US Cents Coins: " + to_string((int)(r1/25));

r1= r1-(int)(r1/25)*25;

str += " Ten US Cents Coins: " + to_string((int)(r1/10));

r1 = r1-(int)(r1/10)*10;

str += " Five US Cents Coins: " + to_string((int)(r1/5));

r1= r1-(int)(r1/5)*5;

str += " One US Cents Coins: " + to_string(r1);

r1= 0;

return str;

}

int main(){

double c,p;

string check="y";

cout<<"Enter a value :";

cin>>c;

while(c!=0 && check!="n"){

cout<<"Enter an amount of purchases made against this amount : ";

cin>>p;

if(p>c){

cout<<"purchases cannot exceed cash value "<<endl;

}

else{

cout << calculateChange(p, c);

}

cout<<"Continue(y/n)? ";

cin>>check;

c=c-p;

}

return 0;

}

Now, after creating this file, you can use it in other files too.

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