Example 1: how to make a calculator inc++
// 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;
double answer = 0;
switch (op) {
case '+':
answer = n1 + n2;
break;
case '-':
answer = n1 - n2;
break;
case '*':
answer = n1 * n2;
break;
case '/':
answer = n1 / n2;
break;
}
cout << "Thanks for using my calculator your answer is: " << answer;
// 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;
double answer = 0;
switch (op) {
case '+':
answer = n1 + n2;
break;
case '-':
answer = n1 - n2;
break;
case '*':
answer = n1 * n2;
break;
case '/':
answer = n1 / n2;
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;
}
Example 2: c++ calculator program using switch case
#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<<"****Make your choice****"<<endl;
cout<<"1.Addition"<<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;
}
}
Example 3: calculator with c++
#include <iostream>
using namespace std;
int main()
{
int choice;
cout << 1 << endl;
cout << 2 << endl;
cout << 3 << endl;
cout << 4 << endl;
cout << "Choice A Number: ";
cin >> choice;
if (choice >= 1 && choice <= 4)
{
int a, b;
cout << "Enter Num One: ";
cin >> a;
cout << "Enter Num Two: ";
cin >> b;
if (choice == 1)
cout << a << "+" << b << "=" << a + b << endl;
if (choice == 2)
cout << a << "-" << b << "=" << a - b << endl;
if (choice == 3)
cout << a << "*" << b << "=" << a * b << endl;
}
else
{
cout << "Wrong Choice" << endl;
}
}
Example 4: c++ calculator
#include <iostream>
using namespace std;
int main() {
char setOperator;
float firstNum = 0.00, secondNum = 0.00;
cout << "Enter your operater: +, -, *, /: \n";
cin >> setOperator;
cout << "Enter your first calculation: \n";
cin >> firstNum;
cout << "Enter your second calculation: \n";
cin >> secondNum;
switch(setOperator) {
case '+':
cout << "The answer is: " <<firstNum + secondNum;
break;
case '-':
cout << "The answer is:" << firstNum - secondNum;
break;
case '*':
cout << "The answer is: " << firstNum * secondNum;
break;
case '/':
cout << "The answer is: " << firstNum / secondNum;
break;
}
return 0;
}
Example 5: how to make a calculator in c++
// 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;
}
Example 6: how to build a calculator using c++
#include <iostream>
using namespace std;
int main()
{
int num1;
int num2;
char op;
cout << "Enter a number:" << endl;
cin >> num1; //takes input
cout << "Enter another number:" << endl; //prints some prompt
cin >> num2;
cout << "Enter a operator:" << endl; //prints some prompt
cin >> op;
if(op == '+')
{
cout << "Result = " << num1 + num2 << endl;
}else if(op == '-'){
cout << "Result = " << num1 - num2 << endl;
}else if(op == '*'){
cout << "Result = " << num1 * num2 << endl;
}else if(op == '/'){
cout << "Result = " << num1 / num2 << endl;
}
}