multi memory allocation
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #include <stdio.h> #include <stdlib.h> int main(void) { int ***threeDimensional = calloc (3, sizeof (int**)); // dynamic allocation, height unsigned int horizon = 0, vertical = 0, height = 0; for (vertical = 0; vertical < 4; vertical++) { threeDimensional[vertical] = calloc (4, sizeof (int*)); // dynamic allocation, vertical } for (vertical = 0; vertical < 4; vertical++) { for (horizon = 0; horizon < 5; horizon++) { threeDimensional[vertical][horizon] = calloc (5, sizeof (int)); // dynamic allocation, horizon } } for (height = 0; height < 3; height++) { for (vertical = 0; vertical < 4; vertical++) { for (horizon = 0; horizon < 5; horizon++) { threeDimensional[height][vertical][horizon] = horizon + vertical + height; printf("%d ", threeDimensional[height][vertical][horizon]); } printf("\n"); } printf("\n"); } printf("%d\n", sizeof (threeDimensional)); printf("%d\n", sizeof (*threeDimensional)); printf("%d\n", sizeof (**threeDimensional)); //===================================================== for (vertical = 0; vertical < 4; vertical++) { for (horizon = 0; horizon < 5; horizon++) { free (threeDimensional[vertical][horizon]); // clear dynamic allocation, horizon } } for (vertical = 0; vertical < 4; vertical++) { free (threeDimensional[vertical]); // clear dynamic allocation, vertical } free (threeDimensional); // clear dynamic allocation, height return 0; } | cs |
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