DATA STRUCTURES • ALGORITHMS

Array Input and Output

Input involves reading values from a stream (like keyboard or file) and storing them in array indices. Output involves iterating through the array and sending values to a display or file.

Time

O(N)

Space

O(N) (Storage space)

Key Principle 1

Scanner/Reader for inputs

Key Principle 2

Index-based storage (arr[i])

Key Principle 3

Traversal for printing values

Key Principle 4

Memory allocation occurs first

IO_LAB
Input Data:
Current Step
Goal: Read N integers into an array and then print them back.
Playback
Stream Monitor ⠿
Standard Input (Buffer)
1020304050
Standard Output (Console)
_
I/O Code ⠿
1int[] arr = new int[n];
2Scanner sc = new Scanner(System.in);
3for (int i = 0; i < n; i++) {
4    arr[i] = sc.nextInt(); // Input
5}
6for (int i = 0; i < n; i++) {
7    System.out.print(arr[i] + ' '); // Output
8}
RAM Memory (Array)
?
addr 0
?
addr 1
?
addr 2
?
addr 3
?
addr 4
IDLE

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Array Input Output

Array Input Output

Array Input and Output

Array Input and Output