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Java Exercises: Print the sum of two numbers

Java Basic: Exercise-2 with Solution

Write a Java program to print the sum of two numbers.

In mathematics, summation (capital Greek sigma symbol: ∑) is the addition of a sequence of numbers; the result is their sum or total. The numbers to be summed may be integers, rational numbers, real numbers, or complex numbers.

Pictorial Presentation:

Java: Sum of two numbers

Sample Solution:

Java Code:

public class Exercise2 {
 
 public static void main(String[] args) {
  System.out.println(24+26);
 }
 
}

Sample Output:

50

Flowchart:

Flowchart: Java exercises: Print the sum of two numbers

Sample solution using input from the user:

Java Code:

import java.util.Scanner;

public class Main {
  public static void main(String[] args) 
  {
    Scanner input = new Scanner (System.in);
    System.out.print("Input the first number: ");
    int num1 = input.nextInt();
    System.out.print("Input the second number: ");
    int num2 = input.nextInt();
    int sum = num1 + num2;
    System.out.println();
    System.out.println("Sum: "+sum);
  }
}

Sample Output:

Input the first number:  256
Input the second number:  326

Sum: 582

Flowchart:

Flowchart: Java exercises: Print the sum of two numbers

Java Code Editor:

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Previous: Write a Java program to print 'Hello' on screen and then print your name on a separate line.
Next: Write a Java program to divide two numbers and print on the screen.

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Java: Tips of the Day

Execution of console commands:

Java allows you to execute console commands directly from code using a class Runtime. It is very important not to forget about exception handling.

For example, let's try to open a PDF file through a Java terminal:

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
  
public class ShellCommandExec {
  
  public static void main(String[] args) {
    String gnomeOpenCommand = "gnome-open //home//user//Documents//MyDoc.pdf";
  
    try {
      Runtime rt = Runtime.getRuntime();
      Process processObj = rt.exec(gnomeOpenCommand);
  
      InputStream stdin = processObj.getErrorStream();
      InputStreamReader isr = new InputStreamReader(stdin);
      BufferedReader br = new BufferedReader(isr);
  
      String myoutput = "";
  
      while ((myoutput=br.readLine()) != null) {
        myoutput = myoutput+"\n";
      }
      System.out.println(myoutput);
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}