Advanced Techniques in C Programming — 1

1. Dynamic Memory Allocation and Pointer Arithmetic

This example dynamically allocates memory for an array and uses pointer arithmetic to fill it.

c

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#include <stdio.h>
#include <stdlib.h>

int main() {
    int n;
    printf("Enter the number of elements: ");
    scanf("%d", &n);
    // Dynamic memory allocation
    int *arr = (int *)malloc(n * sizeof(int));
    if (arr == NULL) {
        printf("Memory allocation failed\n");
        return 1;
    }
    // Fill array with values and print using pointer arithmetic
    for (int i = 0; i < n; i++) {
        *(arr + i) = i * 2; // Store value in allocated memory
        printf("%d ", *(arr + i));
    }
    printf("\n");
    // Free allocated memory
    free(arr);
    return 0;
}

Expected Output:

mathematica

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Enter the number of elements: 5
0 2 4 6 8

2. File Handling: Reading and Writing to a File

This program writes to a file and then reads from it.

c

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#include <stdio.h>

int main() {
    FILE *file;
    file = fopen("example.txt", "w");
    if (file == NULL) {…