4. Array Input and Output Operations

4.1 Reading Array Elements 
 4.1.1 Reading with Known Size 
 #include <stdio.h>

int main() {
 int numbers[5];
 
 printf("Enter 5 integers:\n");
 for (int i = 0; i < 5; i++) {
 printf("Element %d: ", i + 1);
 scanf("%d", &numbers[i]);
 }
 
 printf("You entered: ");
 for (int i = 0; i < 5; i++) {
 printf("%d ", numbers[i]);
 }
 printf("\n");
 
 return 0;
}
 
 4.1.2 Reading with User-Specified Size 
 #include <stdio.h>
#define MAX_SIZE 100

int main() {
 int arr[MAX_SIZE];
 int n;
 
 printf("How many numbers do you want to enter (max %d): ", MAX_SIZE);
 scanf("%d", &n);
 
 // Input validation
 if (n <= 0 || n > MAX_SIZE) {
 printf("Invalid size! Please enter between 1 and %d\n", MAX_SIZE);
 return 1;
 }
 
 printf("Enter %d numbers:\n", n);
 for (int i = 0; i < n; i++) {
 printf("Number %d: ", i + 1);
 scanf("%d", &arr[i]);
 }
 
 printf("Your numbers: ");
 for (int i = 0; i < n; i++) {
 printf("%d ", arr[i]);
 }
 printf("\n");
 
 return 0;
}
 
 4.2 Displaying Array Elements 
 4.2.1 Basic Display 
 void print_array(int arr[], int size) {
 printf("Array contents: ");
 for (int i = 0; i < size; i++) {
 printf("%d ", arr[i]);
 }
 printf("\n");
}
 
 4.2.2 Formatted Display 
 void print_array_formatted(int arr[], int size) {
 printf("┌");
 for (int i = 0; i < size; i++) {
 printf("────┬");
 }
 printf("\b┐\n"); // Backspace to replace last ┬ with ┐
 
 printf("│");
 for (int i = 0; i < size; i++) {
 printf("%3d │", arr[i]);
 }
 printf("\n");
 
 printf("└");
 for (int i = 0; i < size; i++) {
 printf("────┴");
 }
 printf("\b┘\n");
 
 printf(" ");
 for (int i = 0; i < size; i++) {
 printf("%3d ", i);
 }
 printf("\n");
}