Question

Write a program whose inputs are three integers, and whose output is the largest of the three values. Ex: If the input is 7 15 3, the output is: 15

Answer 1

Answer:  

Here is the C++ program to find the largest of three integers.

#include <iostream> //to use input output functions

using namespace std; //to identify objects like cin cout

int main(){ //start of main function

int integer1, integer2, integer3;  // declare three integers

   cin>>integer1>>integer2>>integer3;  //reads values of three integers variables from user

   if (integer1 >= integer2 && integer1 >= integer3) //if value of integer1 variable is greater than or equal to both integer2 and integers3 values

       cout<<integer1;   //then largest number is integer1 and it is displayed

   else if (integer2 >= integer1 && integer2 >= integer3) //if value of integer2 variable is greater than or equal to both integer1 and integers3 values

       cout<<integer2;  //then largest number is integer2 and it is displayed

   else //in case value of integer3 variable is greater than or equal to both integer1 and integers2 values

       cout<<integer3; } //then largest number is integer3 and it is displayed

Here is the JAVA program to find the largest of three integers.

import java.util.Scanner; //to take input from user

public class Main{

public static void main(String[] args) {//start of main function

Scanner input= new Scanner(System.in); //a standard input stream.

int integer1= input.nextInt();//declare and read value of first integer

int integer2= input.nextInt();//declare and read value of second integer

int integer3= input.nextInt();//declare and read value of third integer

   if (integer1 >= integer2 && integer1 >= integer3) //if value of integer1 variable is greater than or equal to both integer2 and integers3 values

       System.out.println(integer1);   //then largest number is integer1 and it is displayed

   else if (integer2 >= integer1 && integer2 >= integer3) //if value of integer2 variable is greater than or equal to both integer1 and integers3 values

       System.out.println(integer2); //then largest number is integer2 and it is displayed

   else //when value of integer3 variable is greater than or equal to both integer1 and integers2 values

               System.out.println(integer3);  } } //then largest number is integer3 and it is displayed

Explanation:

The program is well explained in the comments attached with each statement of the program. I will explain the program with the help of an examples. Suppose

integer1 = 7

integer2 = 15

integer3 = 3

first if condition  if (integer1 >= integer2 && integer1 >= integer3) checks if value of integer1 variable is greater than or equal to both integer2 and integers3 values. Since integer1 = 7 so it is greater than integer3 = 3 but less than integer2. So this statement evaluates to false because in && ( AND logical operator) both of the conditions i.e integer1 >= integer2 and integer1 >= integer3 should be true. So the program moves to the else if part.

The else if condition else if (integer2 >= integer1 && integer2 >= integer3) checks if value of integer2 variable is greater than or equal to both integer1 and integer3 values. Since integer2 = 15 so it is greater than integer1 = 7 and also greater than integer3 = 3. So this statement evaluates to true as both parts of the else if condition holds true. So the else if part executes which has the statement: cout<<integer2; which prints the value of integer2 i.e. 15 on output screen.

Output:

15