#include <stdio.h>
#include <time.h>

void print0() {
  for (int i = 0; i < 100; i++) {
    int a = i * i;
  }
    // printf("You chose zero.\n");
}

void print1() {
  for (int i = 0; i < 100; i++) {
    int a = i * i;
  }
    // printf("You chose one.\n");
}

void print2() {
  for (int i = 0; i < 100; i++) {
    int a = i * i;
  }
    // printf("You chose two.\n");
}

int main() {
    // Array of function pointers (jump table)
    void (*operations[3])() = {print0, print1, print2};

    struct timespec start, end;
    long long total_time = 0;
    int num_iterations = 1000;

    clock_gettime(CLOCK_MONOTONIC, &start); // Start time

    for (int i = 0; i < num_iterations; i++) {
        int choice = i % 3; // Simulate user choices (0, 1, 2)
        
        // Call the function pointed to by operations[choice]
        (*operations[choice])();
    }

    clock_gettime(CLOCK_MONOTONIC, &end); // End time

    // Compute the total time in nanoseconds
    total_time = (end.tv_sec - start.tv_sec) * 1000000000LL + (end.tv_nsec - start.tv_nsec);

    printf("Total time for %d iterations: %lld nanoseconds\n", num_iterations, total_time);

    printf("Average time per iteration: %lld nanoseconds\n", total_time / num_iterations);

    // Implement using switch case and measure time
    clock_gettime(CLOCK_MONOTONIC, &start); // Start time
    for (int i = 0; i < num_iterations; i++) {
        int choice = i % 3; // Simulate user choices (0, 1, 2)
        
        // Call the function pointed to by operations[choice]
        switch (choice) {
            case 0:
                print0();
                break;
            case 1:
                print1();
                break;
            case 2:
                print2();
                break;
        }
    }
    clock_gettime(CLOCK_MONOTONIC, &end); // End time
    total_time = (end.tv_sec - start.tv_sec) * 1000000000LL + (end.tv_nsec - start.tv_nsec);
    printf("Total time for %d iterations using switch case: %lld nanoseconds\n", num_iterations, total_time);
    printf("Average time per iteration using switch case: %lld nanoseconds\n", total_time / num_iterations);


    return 0;
}