Write a Program to find the greatest number among the three numbers

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Write a Program to find the greatest number among the three numbers
vinaykhatri

Vinay Khatri
Last updated on March 28, 2024

    Problem Statement

    We have given 3 numbers num_1 , num_2 and num_3 , as input from the user and we need to write a script or program that print the greatest one.

    For Example

    Input

    num_1 = 20
    num_2 = 30
    num_3 = 40

    Output

    The greatest number is: 40

    Solution

    The problem is very simple and beginner level. To solve the problem we just need to check if the num_1 is greater or equal to than num_2 and num_3 . If yes we will print the num_1 is the greatest, if not we will check if num_2 is greater than or equal num_1 and num_3 if yes we will print that num_2 is the greatest. Even if num_2 is not the greatest we will simply print that num_3 is the greatest. To solve this problem we only require of...else statement.

    C Program to Find the Greatest Number among the three numbers

    #include <stdio.h>
    
    int main()
    {	
    	int num_1,num_2,num_3;
    	//input the first number
    	printf("Enter the first number: ");
    	scanf("%d", &num_1);
    	
    	//input the second number
    	printf("Enter the second number: ");
    	scanf("%d", &num_2);
    	
    	// input the third number 
    	printf("Enter the third number: ");
    	scanf("%d",&num_3);
    	
    	//if the number 1 is the greatest
    	if(num_1 >= num_2 && num_1>=num_3)
    		printf("The greatest number is: %d",num_1);
    	
    	// if teh number 2 is the greatest
    	else if(num_2 >=num_1 && num_2>=num_3)
    		printf("The greatest number is: %d",num_2);
    	
    	// if the number 3 is the greatest
    	else
    		printf("The greatest number is: %d" ,num_3);
    	return 0;
    }

    Output

    Enter the first number: 12
    Enter the second number: 45
    Enter the third number: 15
    The greatest number is: 45

    C++ Program to find the greatest number among the three numbers

    #include<iostream>
    using namespace std;
    int main()
    {
    	int num_1,num_2,num_3;
    	
    	//input the first number
    	cout<<"Enter the first number: "; cin>>num_1;
    	
    	//input the second number
    	cout<<"Enter the second number: "; cin>>num_2;
    	
    	//input the third number
    	cout<<"Enter the third number: "; cin>>num_3;
    	
    	//check if number 1 is the greatest
    	if(num_1 >= num_2 && num_1>=num_3)
    		cout<<"The greatest number is: "<<num_1; 
           
           //check if number 2 is the greatest 
           else if(num_2 >=num_1 && num_2>=num_3)
    		cout<<"The greatest number is: "<<num_2;
    	
    	//if the number 3 is the greatest
    	else
    		cout<<"The greatest number is: " <<num_3;
    	return 0; 
    }

    Output:

    Enter the first number: 12
    Enter the second number: 23
    Enter the third number: 54
    The greatest number is: 54

    Python Program to find the greatest number among the three numbers

    # input the first number
    num_1= int(input("Enter the first number: "))
    
    # input the second number
    num_2= int(input("Enter the second number: "))
    
    # input the third number
    num_3= int(input("Enter the third number: "))
    
    # if the number 1 is the greatest
    if num_1>=num_2  and num_1 >= num_3:
        print("The greatest number is:", num_1)
    
    # if the numer 2 is the greatest
    elif num_2>=num_1  and num_2 >= num_2:
        print("The greatest number is:", num_2)
    
    # if the number 3 is the greatest
    else:
        print("The greatest number is:", num_3)

    Output:

    Enter the first number: 45
    Enter the second number: 78
    Enter the third number: 23
    The greatest number is: 78

    Wrapping Up!

    In this programming tutorial, we learned how to find out the greatest number among 3 numbers. The trick to solve this problem is lies behind the use of if....else statements with proper conditions. Here we only have 3 numbers which mean we can easily use the if....else statement and check for every number if the number is greater than or equal to the other two numbers.

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