Mastering Nested Loops in Java

Front

What is the output of the following Java code snippet?
```java
for(int i = 0; i < 2; i++) {
for(int j = 0; j < 2; j++) {
System.out.print(i + " " + j + " ");
}
}
```

Back

0 0 0 1 1 0 1 1

Front

Back

Front

Identify the error in the following nested loop code:
```java
for(int i = 0; i < 3; i++) {
for(int j = 0; j < 3; j++);
System.out.println(i + " " + j);
}
```

Back

The semicolon after the inner loop

Front

In a real-world application, which of the following scenarios is most likely to use nested loops? Calculating the sum of an array, Searching for an element in a list, Generating a multiplication table, Sorting an array

Back

Generating a multiplication table

Front

Consider the following code snippet. What will be the output?
```java
int[][] matrix = {{1, 2}, {3, 4}};
for(int i = 0; i < matrix.length; i++) {
for(int j = 0; j < matrix[i].length; j++) {
System.out.print(matrix[i][j] + " ");
}
}
```

Back

1 2 3 4

Front

How can you optimize a nested loop that iterates over a 2D array to improve performance?

Back

Use parallel processing if possible

Front

Which of the following is a common debugging technique for nested loops? Options: Using a debugger to step through each iteration, Increasing the loop counter increment, Removing the inner loop, Changing the loop condition to false

Back

Using a debugger to step through each iteration

Front

What is the primary reason for increased complexity in nested iterations?

Back

Increased number of iterations

Front

Which of the following real-world applications would most likely require the use of nested loops?
Options:
Calculating factorial of a number,
Simulating a chessboard,
Finding the maximum value in an array,
Checking if a number is prime

Back

Simulating a chessboard

Front

Given the following code, what will be the output?
```java
for(int i = 1; i <= 3; i++) {
for(int j = 1; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}
```
Options:
```
*
**
***
```,
```
***
**
*
```,
```
***
***
***
```,
```
*
*
*
```

Back

```
*
**
***
```