C++ Program to Find Largest Number Among Three Numbers

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Largest Number Among Three
(Last Updated On: September 1, 2018)

In this Program, you’ll learn to find the Largest Number Among Three numbers using if, if else and nested if else statements.

To understand this program to find the Largest Number Among Three, you should have the knowledge of following C++ programming topics:

  • C++ if, if…else and Nested if…else

In this program, a user is asked to enter three numbers.

Then this program finds out the largest number of three numbers entered by the user and displays it with a proper message.

This program can be used in more than one way.

Program to Find Largest Number Using if Statement

#include <iostream>
using namespace std;

int main()
{    
    float n1, n2, n3;

    cout << "Enter three numbers: ";
    cin >> n1 >> n2 >> n3;

    if(n1 >= n2 && n1 >= n3)
    {
        cout << "Largest number: " << n1;
    }

    if(n2 >= n1 && n2 >= n3)
    {
        cout << "Largest number: " << n2;
    }

    if(n3 >= n1 && n3 >= n2) {
        cout << "Largest number: " << n3;
    }

    return 0;
}

Output

Enter three numbers: 2.3
8.3
-4.2
Largest number: 8.3

Program to Find Largest Number Using if Statement

Program to Find Largest Number Using if…else Statement

#include <iostream>
using namespace std;

int main()
{
    float n1, n2, n3;

    cout << "Enter three numbers: ";
    cin >> n1 >> n2 >> n3;

    if((n1 >= n2) && (n1 >= n3))
        cout << "Largest number: " << n1;
    else if ((n2 >= n1) && (n2 >= n3))
        cout << "Largest number: " << n2;
    else
        cout << "Largest number: " << n3;
    
    return 0;
}

Output

Enter three numbers: 2.3
8.3
-4.2
Largest number: 8.3

Program to Find Largest Number Using if…else Statement

Program to Find Largest Number Using Nested if…else statement

#include <iostream>
using namespace std;

int main()
{
    float n1, n2, n3;

    cout << "Enter three numbers: ";
    cin >> n1 >> n2 >> n3;

    if (n1 >= n2)
    {
        if (n1 >= n3)
            cout << "Largest number: " << n1;
        else
            cout << "Largest number: " << n3;
    }
    else
    {
        if (n2 >= n3)
            cout << "Largest number: " << n2;
        else
            cout << "Largest number: " << n3;
    }

    return 0;
}

Output

Enter three numbers: 2.3
8.3
-4.2
Largest number: 8.3

Program to Find Largest Number Using Nested if…else statement

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