faster_c.c

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

#define MAX 512

int array[MAX][MAX][MAX];

int main(void) {
    int i, j, k;
    clock_t t1, t2;
    
    t1 = clock();
    for (i = 0; i < MAX; i++) {
        for (j = 0; j < MAX; j++) {
            for (k = 0; k < MAX; k++) {
                array[k][j][i] = i * j * k;
            }
        }
    }
    t2 = clock();
    printf("M: %f secs\n", (t2 - t1 + 0.0)/CLOCKS_PER_SEC);
    
    t1 = clock();
    for (i = 0; i < MAX; i++) {
        for (j = 0; j < MAX; j++) {
            for (k = 0; k < MAX; k++) {
                array[i][j][k] = i * j * k;
            }
        }
    }
    t2 = clock();
    printf("C:  %f secs\n", (t2 - t1 + 0.0)/CLOCKS_PER_SEC);
    
    return 0;
}