7. Arrays

Declaration, initialization, indexing, iteration, and passing arrays to functions in C.

Arrays store elements of the same type contiguously in memory.

• Declaration, initialization
• Indexing and iteration
• Passing arrays to functions
• Multidimensional arrays

Examples

Print Array Elements (array_print.c)

Demonstrates array declaration, initialization, and iteration with a for loop:

#include <stdio.h>

int main(void) {
    int a[5] = {1, 2, 3, 4, 5};
    for (int i = 0; i < 5; i++) {
        printf("a[%d] = %d\n", i, a[i]);
    }
    return 0;
}

Sum Array Elements (array_sum.c)

Shows how to pass an array to a function using a pointer parameter:

#include <stdio.h>

int sum_array(const int *arr, int n) {
    int s = 0;
    for (int i = 0; i < n; i++) s += arr[i];
    return s;
}

int main(void) {
    int a[] = {2, 4, 6, 8};
    int n = (int)(sizeof a / sizeof a[0]);
    printf("Sum = %d\n", sum_array(a, n));
    return 0;
}