创建、遍历、销毁一个二维数组

1.创建二维数组

int** create(const int row, const int col) {
	/*根据参数row和col，创建一个矩阵，返回指针*/
	int** matrix = (int**)malloc(sizeof(int*) * row);
	for (int i = 0; i < row; i++) {
		matrix[i] = (int*)malloc(sizeof(int) * col);
	}
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			scanf("%d", &(matrix[i][j]));
		}
	}
	return matrix;
}

2.遍历二维数组

void traverse(int** matrix, const int row, const int col) {
	/*遍历二维数组matrix*/
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			printf("%d ", matrix[i][j]);
		}
		printf("\n");
	}
}

3.销毁二维数组

void destroy(int** matrix, const int row) {
	/*释放二维数组matrix占用的堆内存*/
	int i = 0;
	while (i < row) {
		free(matrix[i]);
		matrix[i] = NULL;
		i++;
	}
	free(matrix); 
	matrix = NULL;
}

4.完整代码

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#include <stdio.h>
#include <stdlib.h>

int** create(const int row, const int col);
void traverse(int** matrix, const int row, const int col);
void destroy(int** matrix, const int row);

int main(int argc, char* argv[]) {
	/*二级指针指向一个二维数组*/
	int row, col;
	scanf("%d %d", &row, &col);

	/*创建，遍历，销毁二维数组*/
	int** matrix = create(row, col);
	traverse(matrix, row, col);
	destroy(matrix, row);
	matrix = NULL;

	return 0;
}

int** create(const int row, const int col) {
	/*根据参数row和col，创建一个矩阵，返回指针*/
	int** matrix = (int**)malloc(sizeof(int*) * row);
	for (int i = 0; i < row; i++) {
		matrix[i] = (int*)malloc(sizeof(int) * col);
	}
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			scanf("%d", &(matrix[i][j]));
		}
	}
	return matrix;
}

void traverse(int** matrix, const int row, const int col) {
	/*遍历二维数组matrix*/
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			printf("%d ", matrix[i][j]);
		}
		printf("\n");
	}
}

void destroy(int** matrix, const int row) {
	/*释放二维数组matrix占用的堆内存*/
	int i = 0;
	while (i < row) {
		free(matrix[i]);
		matrix[i] = NULL;
		i++;
	}
	free(matrix); 
	matrix = NULL;
}