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

int main() {
    FILE *fp;
    int numbers[100], read_numbers[100];
    int i;

    // Initialize array with values 1 to 100
    for (i = 0; i < 100; i++) {
        numbers[i] = i + 1;
    }

    // --- Writing to file using fwrite ---
    fp = fopen("numbers.bin", "wb");
    if (fp == NULL) {
        perror("Error opening file for writing");
        return 1;
    }

    size_t written = fwrite(numbers, sizeof(int), 100, fp);
    if (written != 100) {
        perror("Error writing to file");
        fclose(fp);
        return 1;
    }

    fclose(fp);
    printf("Successfully wrote 100 integers to file.\n");

    // --- Reading back using fread ---
    fp = fopen("numbers.bin", "rb");
    if (fp == NULL) {
        perror("Error opening file for reading");
        return 1;
    }

    size_t read = fread(read_numbers, sizeof(int), 100, fp);
    if (read != 100) {
        perror("Error reading from file");
        fclose(fp);
        return 1;
    }

    fclose(fp);
    printf("Successfully read %zu integers from file.\n", read);

    // --- Display first 10 numbers for verification ---
    printf("First 10 integers read from file:\n");
    for (i = 0; i < 10; i++) {
        printf("%d ", read_numbers[i]);
    }
    printf("\n");

    return 0;
}