wegwfg2f2t

#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define NUM_SAMPLES 500000000

int randomInt(int min, int max) {
    return rand() % max + min;
}

int main() {
    srand(42);

    printf("Starting.\n");

    // Create a large (500M?) array of int16_t numbers to represent sound samples.
    int16_t* nums = calloc(NUM_SAMPLES, 2);

    for (int i = 0; i < NUM_SAMPLES; i++) {
        nums[i] = randomInt(INT16_MIN, INT16_MAX);
    }

    clock_t begin = clock();

    // TEST

    // Scale each sample by the volume factor (0.75). Store the results into the original array or into a separate result array.
    // Convert the volume factor 0.75 to a fix-point integer by multiplying by a binary number representing a fixed-point value "1".
    for (int i = 0; i < NUM_SAMPLES; i++) {
        int16_t volumeInt = 0.75 * 0b100000000;
        int16_t shifted = volumeInt >>8;
        nums[i] = nums[i] * shifted;
    }

    // /TEST

    clock_t end = clock();

    // Anti-optimization
    int sum = 0;
    for (int i = 0; i < NUM_SAMPLES; i++) {
        sum += nums[i];
    }
    // /Anti-optimization

    double time_spent = (double)(end - begin) / CLOCKS_PER_SEC;

    printf("Sum: %d, Time spent: %.3f\n", sum, time_spent);

    return 0;
}