“Linux-2018-spring-main”的版本间的差异
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| （未显示另一用户的1个中间版本） | |||
| 第1行： | 第1行： | ||
| − | + | *#include <stdio.h> | |
| − | + | * | |
| − | + | *int my_matrix3(int n, int d) { | |
| − | + | * int i, j, k, l; | |
| − | + | * int **_pp = (int **)malloc(sizeof(int*)*n); | |
| − | + | * int *p = _pp[0] = (int*) malloc(sizeof(int)*n*d); | |
| − | + | * for (l = 1; l < n; l++) { | |
| − | + | * _pp[l] = &_p[l*d]; | |
| − | + | * } | |
| − | + | * for (i = 0; i < n; i++) { | |
| − | + | * for (j = 0; j < d; j++) { | |
| − | + | * _pp[i][j] = i*j; | |
| − | + | * } | |
| − | + | * } | |
| − | + | * for (k = 0; k < n*d; ++k) { | |
| − | + | * printf("%d ", _p[k]); | |
| − | + | * if ((k+1) % d == 0) printf("\n"); | |
| − | + | * } | |
| − | + | * free(_p); | |
| − | + | * free(_pp); | |
| − | + | *} | |
| + | *int my_matrix2(int n, int d) { | ||
| + | * int *_p = (int*) malloc(sizeof(int)*n*d); | ||
| + | * int **_pp = (int **)malloc(sizeof(int*)*n); | ||
| + | * int i, j, k, l; | ||
| + | * for (l = 0; l < n; l++) { | ||
| + | * _pp[l] = &_p[l*d]; | ||
| + | * } | ||
| + | * for (i = 0; i < n; i++) { | ||
| + | * for (j = 0; j < d; j++) { | ||
| + | * _pp[i][j] = i*j; | ||
| + | * } | ||
| + | * } | ||
| + | * for (k = 0; k < n*d; ++k) { | ||
| + | * printf("%d ", _p[k]); | ||
| + | * if ((k+1) % d == 0) printf("\n"); | ||
| + | * } | ||
| + | * free(_p); | ||
| + | * free(_pp); | ||
| + | *} | ||
| + | * | ||
| + | *int my_matrix(int n, int d) { | ||
| + | * int *_p = (int*) malloc(sizeof(int)*n*d); | ||
| + | * int i, j, k; | ||
| + | * for (i = 0; i < n; i++) { | ||
| + | * for (j = 0; j < d; j++) { | ||
| + | * _p[i*d+j] = i*j; | ||
| + | * } | ||
| + | * } | ||
| + | * for (k = 0; k < n*d; ++k) { | ||
| + | * printf("%d ", _p[k]); | ||
| + | * if ((k+1) % d == 0) printf("\n"); | ||
| + | * } | ||
| + | * free(_p); | ||
| + | *} | ||
| − | + | *int main() { | |
| − | + | * my_matrix(3, 4); | |
| − | + | * my_matrix2(3, 4); | |
| − | + | *} | |
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| − | } | ||
2020年5月13日 (三) 05:21的最新版本
- include <stdio.h>
- int my_matrix3(int n, int d) {
- int i, j, k, l;
- int **_pp = (int **)malloc(sizeof(int*)*n);
- int *p = _pp[0] = (int*) malloc(sizeof(int)*n*d);
- for (l = 1; l < n; l++) {
- _pp[l] = &_p[l*d];
- }
- for (i = 0; i < n; i++) {
- for (j = 0; j < d; j++) {
- _pp[i][j] = i*j;
- }
- }
- for (k = 0; k < n*d; ++k) {
- printf("%d ", _p[k]);
- if ((k+1) % d == 0) printf("\n");
- }
- free(_p);
- free(_pp);
- }
- int my_matrix2(int n, int d) {
- int *_p = (int*) malloc(sizeof(int)*n*d);
- int **_pp = (int **)malloc(sizeof(int*)*n);
- int i, j, k, l;
- for (l = 0; l < n; l++) {
- _pp[l] = &_p[l*d];
- }
- for (i = 0; i < n; i++) {
- for (j = 0; j < d; j++) {
- _pp[i][j] = i*j;
- }
- }
- for (k = 0; k < n*d; ++k) {
- printf("%d ", _p[k]);
- if ((k+1) % d == 0) printf("\n");
- }
- free(_p);
- free(_pp);
- }
- int my_matrix(int n, int d) {
- int *_p = (int*) malloc(sizeof(int)*n*d);
- int i, j, k;
- for (i = 0; i < n; i++) {
- for (j = 0; j < d; j++) {
- _p[i*d+j] = i*j;
- }
- }
- for (k = 0; k < n*d; ++k) {
- printf("%d ", _p[k]);
- if ((k+1) % d == 0) printf("\n");
- }
- free(_p);
- }
- int main() {
- my_matrix(3, 4);
- my_matrix2(3, 4);
- }