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This is a basic calculator I made in C++. I am learning C++ on my own.

#include <iostream>
using namespace std;

float Add (float &a,float &b)
{
	float c;
	c=a+b;
	return (c);
}

float Subtract (float &a,float &b)
{
	float c;
	c=a-b;
	return (c);
}

float Divide (float &a,float &b)
{
	float c;
	c=a/b;
	return (c);
}

float Multiply (float &a,float &b)
{
	float c;
	c=a*b;
	return (c);
}

int main ()
{
	for (int g=1;g!=0;g++)
	{
		int a, b;
		cout << "Calculator Made By Matthew Sedam.\n";
		cout << "1 - Add.\n";
		cout << "2 - Subtract.\n";
		cout << "3 - Multiply.\n";
		cout << "4 - Divide.\n";
		cin >> a;
		if (a!=1,2,3,4)
		{
			return 0;
		}
		if (a==1)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Add(b,c); 
			cout << b << " + " << c << "= " << d << ".\n";
		}
		if (a==2)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Subtract(b,c); 
			cout << b << " - " << c << "= " << d << ".\n";
		}
		if (a==3)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Multiply(b,c); 
			cout << b << " X " << c << "= " << d << ".\n";
		}
		if (a==4)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Divide(b,c); 
			cout << b << " / " << c << "= " << d << ".\n";
		}
	}
	return 0;
}
Attachments
#include <iostream>
using namespace std;

float Add (float &a,float &b)
{
	float c;
	c=a+b;
	return (c);
}

float Subtract (float &a,float &b)
{
	float c;
	c=a-b;
	return (c);
}

float Divide (float &a,float &b)
{
	float c;
	c=a/b;
	return (c);
}

float Multiply (float &a,float &b)
{
	float c;
	c=a*b;
	return (c);
}

int main ()
{
	for (int g=1;g!=0;g++)
	{
		int a, b;
		cout << "Calculator Made By Matthew Sedam.\n";
		cout << "1 - Add.\n";
		cout << "2 - Subtract.\n";
		cout << "3 - Multiply.\n";
		cout << "4 - Divide.\n";
		cin >> a;
		if (a!=1,2,3,4)
		{
			return 0;
		}
		if (a==1)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Add(b,c); 
			cout << b << " + " << c << "= " << d << ".\n";
		}
		if (a==2)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Subtract(b,c); 
			cout << b << " - " << c << "= " << d << ".\n";
		}
		if (a==3)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Multiply(b,c); 
			cout << b << " X " << c << "= " << d << ".\n";
		}
		if (a==4)
		{
			float b,c,d;
			cout << "Enter the First Number.\n";
			cin >> b;
			cout << "Enter the Second Number.\n";
			cin >> c;
			d = Divide(b,c); 
			cout << b << " / " << c << "= " << d << ".\n";
		}
	}
	return 0;
}
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