Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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.
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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.
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