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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Question

Write a program that will randomly display the times tables using an expression in a loop.  

That expression will multiply x by each of the numbers 1 through 12.

Display numbers on each line in order.  

Produce one for loop and an identical while loop performing  the identical process in one program.  

( I highlighted where I get confused, and where I get the syntax error. Am I incoroprating the highlighted parts in the string. //Your Code here! (what does that mean. 

```plaintext
Java Program Code with Syntax Error:

int n=7, i, mul=0;
for(i=1; i<=12; i++) {
    mul=(n*i);
    System.out.println(n+"x"+i+"="+mul);
}

Error Message:
SyntaxError
Invalid syntax.
```

### Detailed Explanation

#### Code Analysis:

The code snippet on the left is written in a Java-like pseudocode and attempts to calculate and print the multiplication table for the number 7 up to 12. Here is how the code works:

1. **Initialization:**
   - `int n=7, i, mul=0;` initializes the variable `n` with the value 7, which is the number to be multiplied. Variables `i` and `mul` are also initialized. 

2. **For Loop:**
   - `for(i=1; i<=12; i++)` iterates from 1 through 12.
   - Inside the loop, `mul=(n*i);` calculates the product of `n` and `i`.
   - `System.out.println(n+"x"+i+"="+mul);` prints the multiplication results in the format `n x i = mul`.

#### Error Description:

There is a syntax error highlighted by a popup message indicating "invalid syntax". This might be due to a missing part of the Java program structure, such as the enclosing `public class` and `main` method declarations, or simply the context in which this code is being executed isn't Java.

#### Correct Java Code Template:

In contrast, the corrected Java program structure is provided on the right, ensuring proper syntax:

```java
public class Main {
    public static void main(String[] args) throws Exception {
        int n=7, i, mul=0;
        for(i=1; i<=12; i++) {
            mul = (n*i);
            System.out.println(n + " x " + i + " = " + mul);
        }
    }
}
```

- This corrected version includes the necessary `public class Main` and `public static void main` with the proper syntax needed to execute a Java program.
expand button
Transcribed Image Text:```plaintext Java Program Code with Syntax Error: int n=7, i, mul=0; for(i=1; i<=12; i++) { mul=(n*i); System.out.println(n+"x"+i+"="+mul); } Error Message: SyntaxError Invalid syntax. ``` ### Detailed Explanation #### Code Analysis: The code snippet on the left is written in a Java-like pseudocode and attempts to calculate and print the multiplication table for the number 7 up to 12. Here is how the code works: 1. **Initialization:** - `int n=7, i, mul=0;` initializes the variable `n` with the value 7, which is the number to be multiplied. Variables `i` and `mul` are also initialized. 2. **For Loop:** - `for(i=1; i<=12; i++)` iterates from 1 through 12. - Inside the loop, `mul=(n*i);` calculates the product of `n` and `i`. - `System.out.println(n+"x"+i+"="+mul);` prints the multiplication results in the format `n x i = mul`. #### Error Description: There is a syntax error highlighted by a popup message indicating "invalid syntax". This might be due to a missing part of the Java program structure, such as the enclosing `public class` and `main` method declarations, or simply the context in which this code is being executed isn't Java. #### Correct Java Code Template: In contrast, the corrected Java program structure is provided on the right, ensuring proper syntax: ```java public class Main { public static void main(String[] args) throws Exception { int n=7, i, mul=0; for(i=1; i<=12; i++) { mul = (n*i); System.out.println(n + " x " + i + " = " + mul); } } } ``` - This corrected version includes the necessary `public class Main` and `public static void main` with the proper syntax needed to execute a Java program.
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