# C++ program to find the largest number between three numbers using class

Given three numbers, we have to find the largest number among them class and object approach.
Submitted by Shubh Pachori, on August 04, 2022

Example:

```Input:
Enter 1st Number:33
Enter 2nd Number:44
Enter 3rd Number:11
Output:
44 is greater than 33 and 11
```

## C++ Code to find the largest number among three numbers using class and object approach

```#include <iostream>
using namespace std;

// create a class
class LargestNumber {
// private data members
private:
int number_1, number_2, number_3;

// public function with three int type parameters
public:
void largest(int n_1, int n_2, int n_3) {
// copying values of parameters in the data members
number_1 = n_1;
number_2 = n_2;
number_3 = n_3;

// if condition to check if the first number is the greatest
if ((number_1 > number_2) && (number_1 > number_3)) {
cout << number_1 << " is greater than " << number_2 << " and " << number_3
<< endl;
}

// else if condition to check if the second number is the greatest
else if ((number_2 > number_1) && (number_2 > number_3)) {
cout << number_2 << " is greater than " << number_1 << " and " << number_3
<< endl;
}

// else condition for the third number
else {
cout << number_3 << " is greater than " << number_1 << " and " << number_2
<< endl;
}
}
};

int main() {
// create a object
LargestNumber L;

// declare three int type variables for storing numbers
int n_1, n_2, n_3;

cout << "Enter 1st Number: ";
cin >> n_1;

cout << "Enter 2nd Number: ";
cin >> n_2;

cout << "Enter 3rd Number: ";
cin >> n_3;

// calling function using object
L.largest(n_1, n_2, n_3);

return 0;
}
```

Output

```RUN 1:
Enter Number: 5
Sum of first 5 Natural Number is 15

RUN 2:
Enter Number: 25
Sum of first 25 Natural Number is 325

RUN 3:
Enter Number: 3
Sum of first 3 Natural Number is 6
```

Explanation:

In the above code, we have created a class LargestNumber, three int type data members number_1, number_2, and number_3 to store the numbers, and a public member function largest() to find out the largest among the given integer numbers.

In the main() function, we are creating an object L of class LargestNumber, reading three integer numbers by the user, and finally calling the largest() member function to find out the largest among the given integer numbers. The largest() function contains the logic to check the largest of the given numbers and printing the largest number.