Understanding Nested Loops in C

What is a nested loop in C programming?

• A loop that only executes once in C programming.

• A loop that runs indefinitely in C programming.

• A loop that can only be used with arrays in C programming.

• A nested loop is a loop within another loop in C programming.

How do you declare a nested loop in C?

• for(int i = 0; i < rows; i++) { for(int j = 0; j < cols; j++) { /* code */ } }

• while(i < rows) { for(int j = 0; j < cols; j++) { /* code */ } }

• for(int j = 0; j < cols; j++) { for(int i = 0; i < rows; i++) { /* code */ } }

• for(int i = 0; i < rows; i++) { while(j < cols) { /* code */ } }

What is the output of the following code snippet: for(int i=0; i<3; i++) { for(int j=0; j<2; j++) { printf("%d %d\n", i, j); }}?

• 0 2

• 0 0 0 1 1 0 1 1 2 0 2 1

• 2 2

• 1 2

Can you explain the difference between a nested for loop and a nested while loop?

• Nested for loops are more efficient than nested while loops in all cases.

• A nested for loop can only be used with arrays, while a nested while loop can only be used with conditions.

• A nested for loop uses for loops, while a nested while loop uses while loops.

• A nested while loop cannot contain another while loop inside it.

What are some common use cases for nested loops in programming?

• Displaying a static message on the screen

• Reading user input from the console

• Sorting a single-dimensional array

• Common use cases for nested loops include iterating through multi-dimensional arrays, generating combinations or permutations, processing nested data structures, and comparing elements in collections.

How does the time complexity of nested loops compare to single loops?

• Single loops are always more efficient than nested loops.

• Nested loops have the same time complexity as single loops.

• Nested loops can have lower time complexity than single loops.

• Nested loops have higher time complexity than single loops.

What will happen if the inner loop has a condition that is always false?

• The inner loop will cause an error.

• The inner loop will not execute.

• The inner loop will execute once.

• The inner loop will execute indefinitely.

Can you provide an example of a nested loop that prints a multiplication table?

• for (int i = 1; i <= 10; i++) { for (int j = 1; j <= 10; j++) { System.out.print(i * j + " "); } System.out.println(); }

• for (int i = 0; i <= 10; i++) { for (int j = 0; j <= 10; j++) { System.out.print(i + j + " "); } }

• for (int i = 1; i < 10; i++) { System.out.println(i * 10); }

• for (int i = 1; i <= 5; i++) { for (int j = 1; j <= 5; j++) { System.out.print(i - j + " "); } }

What is the maximum number of nested loops you can have in C?

• A maximum of 10 nested loops

• Only 1 nested loop is allowed

• Nested loops are not permitted in C

• Theoretically unlimited, but practically around 255 or more depending on the compiler.

How can you optimize nested loops to improve performance?

• Use only single-threaded execution

• Increase loop depth

• Reduce iterations, use efficient data structures, flatten loops, parallelize, and profile for bottlenecks.

• Ignore data structure selection