C++ Program to Find Largest Number Among Three Numbers


In this Tutorial you’ll learn to find the largest number among three numbers using if, if else and nested if else statements.


To understand this program, you should have the knowledge of following  C++ programming topics:

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

User is asked to enter three numbers.

The program finds out the largest number among three numbers entered by user and displays it with proper message.

 


Example 1: 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

 


Example 2: 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

 


Example 3: 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

 

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