In C++ we can implement a logic to write a **program to find largest of 3 numbers**. So for **finding maximum number** from given two, three or more numbers, this is just simple, we just need to use the ” if ” conditional statement and use the ” < ” or ” > ” operators to **check out the maximum number or minimum number** or whatever it is. This is the **C++ program to find largest of 3 numbers given**:

// program to find largest of 3 numbers entered by user. #include <iostream> using namespace std; double maximum( double, double, double ); // function prototype int main() { double number1; double number2; double number3; cout << "Enter three floating-point numbers: "; cin >> number1 >> number2 >> number3; // number1, number2 and number3 are arguments to // the maximum function call cout << "Maximum is: " << maximum( number1, number2, number3 ) << endl; return 0; // indicates successful termination } double maximum( double x, double y, double z ) { double max = x; if ( y > max ) // if y is larger, max = y; if ( z > max ) // if z is larger, max = z; return max; // max is largest value } // end function maximum

In the above given code as explained in comments, we are given three numbers of datatype “double” in which we are going to **find out the maximum number **.Then we passed it to the function which is able to **decide the maximum number**, in the function we used the ” if ” conditional statement and **found the largest of 3 numbers** and then returned it to the main().