Identifiers declared inside a block: scope { // block begins int x; // local in block x = 9; System.out.println(x) ; } // block ends have block scope, are called local variables and are visible only inside the block. Local variables in different blocks may have the same name. What is the output of the program? public static void main (String[] a) { int x; // local in main x = 1; } System.out.println("Main x methodl () ; void methodl () { System.out.println ("Main x " + x); method2 () ; + x); int x = 0; // local in method System.out.println("methodl x"+ x); void method2 () { System.out.println ("method2 *"+ x);

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
icon
Related questions
Topic Video
Question

I am struggling with this types of question because I don't understand it, can you please answer the question and can you be very specfic with it.

question:

What is the output of the program?

**Identifiers Declared Inside a Block**

Identifiers declared inside a block:

```java
// block begins
int x; // local in block
x = 9;
System.out.println(x);
// block ends
```

These variables have **block scope**, are called **local variables**, and are visible **only inside the block**.

Local variables in different blocks may have the same name. 

**What is the output of the program?**

---

The program code on the right side:

```java
public static void main (String[] a) {
    int x; // local in main

    x = 1;
    System.out.println("Main x " + x);
    method1();
    System.out.println("Main x " + x);
    method2();
}

void method1() {
    int x = 0; // local in method
    System.out.println("method1 x" + x);
}

void method2() {
    System.out.println("method2 x" + x);
}
```

**Explanation:**

The `main` function declares a local variable `x`, assigns it the value `1`, and prints it. The `method1` function declares its own local variable `x`, assigns it `0`, and prints it. `method2` tries to print `x`, which will result in an error because `x` is not within its scope.

These examples illustrate how local variables are confined to their respective blocks, and even if they share the same name, they do not interfere with each other’s values outside their defined scope.
Transcribed Image Text:**Identifiers Declared Inside a Block** Identifiers declared inside a block: ```java // block begins int x; // local in block x = 9; System.out.println(x); // block ends ``` These variables have **block scope**, are called **local variables**, and are visible **only inside the block**. Local variables in different blocks may have the same name. **What is the output of the program?** --- The program code on the right side: ```java public static void main (String[] a) { int x; // local in main x = 1; System.out.println("Main x " + x); method1(); System.out.println("Main x " + x); method2(); } void method1() { int x = 0; // local in method System.out.println("method1 x" + x); } void method2() { System.out.println("method2 x" + x); } ``` **Explanation:** The `main` function declares a local variable `x`, assigns it the value `1`, and prints it. The `method1` function declares its own local variable `x`, assigns it `0`, and prints it. `method2` tries to print `x`, which will result in an error because `x` is not within its scope. These examples illustrate how local variables are confined to their respective blocks, and even if they share the same name, they do not interfere with each other’s values outside their defined scope.
Expert Solution
steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
Instruction Format
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education