﻿ Java exercises: Print the sum of two numbers - w3resource # 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: Sample Solution:

Java Code:

``````public class Exercise2 {

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

}
```
```

Sample Output:

```50
```

Flowchart: 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: Java Code Editor:

What is the difficulty level of this exercise?

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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;

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();

String myoutput = "";