Check out example codes for "how to make a calculator in c++". It will help you in understanding the concepts better.

Code Example 1

``````// ONLY 29 LINES OF CODE IN TOTAL
// For better calculator scroll down on this post
#include <iostream>
using namespace std;
int main() {
cout << "Please enter the first number: ";
double n1 = 0;
cin >> n1;
cout << "Please enter an operator (+, -, *, /): ";
char op = '0';
cin >> op;
cout << "Please enter a second number: ";
double n2 = 0;
cin >> n2;
switch (op) {
case '+':
break;
case '-':
break;
case '*':
break;
case '/':
break;
}

// this is the better calculator:

#include <iostream>
#include <Windows.h>
using namespace std;
int main() {
char jim = 'j';
do {

cout << "Please enter the first number: ";
double n1 = 0;
cin >> n1;
cout << "Please enter an operator (+, -, *, /): ";
char op = '0';
cin >> op;
cout << "Please enter a second number: ";
double n2 = 0;
cin >> n2;
switch (op) {
case '+':
break;
case '-':
break;
case '*':
break;
case '/':
break;
}
cout << "Thanks for using my calculator your answer is: " << answer << " do you want to run the program again? (y or n) ";
cin >> jim;

} while (jim = 'y' && jim != 'n');
if (jim = 'n') {
cout << "Thanks for using my calculator here is sum epic music";
Beep(329, 300);
Beep(493, 300);
Beep(698, 300);
Beep(659, 600);

Beep(783, 300);
Beep(698, 300);
Beep(659, 600);

Beep(329, 100);
Beep(493, 300);
Beep(698, 300);
Beep(659, 600);

Beep(392, 250);
Beep(440, 200);
Beep(587, 300);

Beep(349, 250);
Beep(587, 500);

Beep(329, 300);
Beep(493, 300);
Beep(698, 300);
Beep(659, 600);

Beep(783, 300);
Beep(698, 300);
Beep(659, 600);

Beep(329, 100);
Beep(493, 300);
Beep(698, 300);
Beep(659, 600);

Beep(392, 250);
Beep(440, 200);
Beep(587, 300);

Beep(349, 250);
Beep(587, 400);
}
return 0;
}``````

Code Example 2

``````// This is for beginners

#include <iostream>

using namespace std;

void greetings() {
cout << "welcome to the calculator made in c++ :D\n";
}

void instructions() {
cout << "Here is the operators you can use + - / *\n";
}

int main()
{
greetings();
instructions();
int num1, num2;
char op;
int result;
char again = 'Y';

while (again == 'y' || again == 'Y') {

cout << "\nEnter your first digit: ";
cin >> num1;

cout << "\nEnter your operator digit: ";
cin >> op;

cout << "\nEnter your second digit: ";
cin >> num2;

if (op == '+') {
result = num1 + num2;
}
else if (op == '-') {
result = num1 - num2;
}
else if (op == '*') {
result = num1 * num2;
}
else if (op == '/') {
result = num1 / num2;
}
else {
cout << "Invalid operator";
}

cout << "= " << result;
cout << "\nDo you want to restart the calculator? (Y or N)";
cin >> again;
}

system("pause>0");

return 0;
}``````

Code Example 3

``````#include<iostream>
using namespace std;
int calculator(int num1,int num2,int num3);
int main()
{
//int num1,num2,num3,choice;
int a,b,c,choice;
cout<<"enter the first number"<<endl;
cin>>a;
cout<<"enter the second number"<<endl;
cin>>b;
cout<<"************************"<<endl;
cout<<"2.Subtraction"<<endl;
cout<<"3.Multiplication"<<endl;
cout<<"4.Division"<<endl;
cout<<"************************"<<endl;

choice=calculator(a,b,c);
return 0;
}
int calculator(int num1,int num2,int num3)
{

int choice;
cin>>choice;
switch(choice)
{

case 1: cout<<"you have selected Addition"<<endl;
num3=num1+num2;
cout<<"Addition of two numbers is "<<num3<<endl;
break;

case 2: cout<<"you have selected Subtraction"<<endl;
num3=num1-num2;
cout<<"Subtraction of two numbers is "<<num3<<endl;
break;

case 3: cout<<"you have selected Multiplication"<<endl;
num3=num1*num2;
cout<<"Multiplication of two numbers is "<<num3<<endl;
break;

case 4: cout<<"You have selected Division"<<endl;
num3=num1/num2;
cout<<"Division of two numbers is "<<num3<<endl;
break;

default: cout<<"You have entered wrong choice"<<endl;
break;
}
}``````

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