Find the Greatest of the Two Numbers in C++

February 14, 2023

Find the Greatest of the Two Numbers in C++

Given two integers as input, the objective is to check both numbers for the greatest and write a code to find the greatest of the two numbers in C++.

Methods to find the greatest of the two numbers in C++

Method 1: Using if-else Statements

Algorithm

For two user inputs num1 and num2.
  • Step 1: Check if both numbers are equal
    • If true then print “Both are equal”
  • Step 2: Else if num1 > num2
    • If true then print num1 greater than num2
  • Step 3: Else num2 has to be thee greatest
    • Print num2 is greater than num1

C++ Code

Run
#include <iostream>
using namespace std;

int main ()
{
    int num1, num2;
    num1=75,num2=85;
 
    if (num1 == num2)
        cout << "both are equal"; else if (num1 > num2)
        cout << num1 << " is greater than " << num2;
    else
        cout << num2 << " is greater than " << num1;

    return 0;
}

// Time Complexity : O(1)
// Space Complexity : O(1)

Output

85 is greater than 75

Sum of N natural numbers

 

Greatest of the Three numbers

Leap year or not

Prime number

Method 2: Using Ternary Operator

Algorithm

This method uses knowledge of ternary operator in C++ For two user inputs num1 and num2.
  • Step 1: Check if both numbers are equal
    • If true then print “Both are equal”
  • Step 2: Use ternary operator as largest = num1 > num2? num1 : num2;
  • Step 3: Print the value of variable largest

C++ Code

Run 
#include<bits/stdc++.h>
using namespace std;

int main ()
{
    int num1, num2, largest;
    num1=32,num2=47; 
 
    if(num1 == num2)
        cout << "Both are Equal\n"; else { largest = num1 > num2? num1 : num2;
        cout << largest << " is largest";
    }

  return 0;
}

// Time Complexity : O(1)
// Space Complexity : O(1)

Output

47 is largest

Method 3: Using inbuilt max() Function

Algorithm

This method uses internal inbuilt function max(a, b) which returns the larger value. For two user inputs num1 and num2.
  • Step 1: Check if both numbers are equal
    • If true then print “Both are equal”
  • Step 2: Use inbuilt function max as max(num1, num2)
  • Step 3: Print the value of returned by max function

C++ Code

Run

#include <iostream>  
// function max available in here
#include <math.h>
using namespace std;

int main ()
{
    int num1, num2;
    num1=45,num2=14;
 
    if (num1 == num2)
        cout << "both are equal";
    else
        cout << max(num1,num2) << " is greater";

    return 0;
}

// Time Complexity : O(1)
// Space Complexity : O(1)

Output

45 is greater

Method 4: Using Classes

This method uses classes and objects concept in C++

C++ Code

Run 
#include <iostream> 
using namespace std;

class PrepInsta
{
    public:
        int calcLargest(int, int);
};

int PrepInsta::calcLargest(int a, int b)
{
    if(a>b)
        return a;
    else
        return b;
}

int main()
{
    PrepInsta obj;
    int num1, num2, largest;
    
    num1=36,num2=23;
    
    largest = obj.calcLargest(num1, num2);
    cout<<"Largest: "<<largest;

    return 0;
}

Output

Largest: 36

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