For Loop
Definition
A for loop is a control flow statement that allows you to repeatedly execute a block of code for a specified number of times or until certain conditions are met.
Analogy
Imagine being on an assembly line where you have to perform the same task multiple times. A for loop is like having instructions that tell you exactly how many times you need to repeat that task before moving on.
Related terms
While Loop: A while loop repeatedly executes a block of code as long as a given condition remains true.
Loop Variable: The loop variable is a variable that keeps track of the current iteration or count in a loop.
Nested Loop: A nested loop is a loop inside another loop. It allows you to perform more complex repetitive tasks by iterating over multiple sets of data simultaneously.
"For Loop" appears in:
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Study guides (5)
Additional resources (5)
Practice Questions (20+)
- How is a for loop different from a while loop?
- What part of a for loop determines when the for loop terminates?
- How can a for loop be converted into a while loop?
- What is the purpose of the incrementer in a for loop?
- When would you choose a while loop over a for loop?
- What part of a for loop isn't necessary?
- What while loop will give the same output as this for loop: for (int i = 0; i < 10; i++) { System.out.println(i); }
- Where does the conditional expression appear in a for loop?
- Where is the incrementer executed in a for loop?
- If an array has eight elements and we used the for loop header `for (int i = 7; i >= 0; i++)` to traverse it in reverse order, what is the result?
- Suppose the array `arr` has a length of 7. If we want to traverse through its first 4 elements, which for loop header should be used?
- If we want to traverse from the second to the seventh element of an array, inclusive, what should the for loop header be?
- What is the advantage of using a for loop over a while loop for array traversal?
- If an array has four elements and we used the for loop header `for (int i = 0; i <= 4; i++)` to traverse it, what is the result?
- Suppose the array `arr` has 5 elements. If we want to traverse through its first 2 elements, which for loop header should be used?
- How can we rewrite the following for loop as an enhanced for loop? int[] array = {5, 4, 10, 23, 15} for (int i = 0; i < array.length; i++) { System.out.println(array[i]); }
- How can we rewrite the following for loop as an enhanced for loop? int[] array = {30, 2, 5, 6} for (int i = array.length-1; i >= 0; i--) { System.out.println(array[i]); }
- Can we rewrite the following for loop as an enhanced for loop? boolean[] array = {true, false, false, true, false, true} for (int i = 0; i < array.length; i+=6) { System.out.println(array[i]); }
- Which ArrayList methods do we use in the for loop implementation of traversing an ArrayList?
- What happens if we try to access an index outside the range of an ArrayList when traversing it using a for loop?
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