# C++ Program to Find Largest Number Among Three Numbers

## Program 1 using if only

``````#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 2 using if else

``````#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 3 using nested if-else

``````#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``````