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

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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