A number will be largest if number is greater than both the other numbers.

#include <iostream>
using namespace std;
int main() {
float a, b, c;
cin >> a >> b >> c;
if(a >= b && a >= c)
    cout << "Largest number: " << a;
if(b >= a && b >= c)
    cout << "Largest number: " << b;
if(c >= a && c >= b)
    cout << "Largest number: " << c;
return 0;
}
Input: 1 2 3
Largest number: 3

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A number will be largest if number is greater than both the other numbers.

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We will use a temporary variable to store one of the numbers to perform the swap operation.

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