Write a C++ Program For Find Largest Number Among Three Numbers

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;
}

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;
}

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) && (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