动态创建二维数组

#include<stdio.h>
#include<stdlib.h>
//动态创建二维数组； 

void CreatArray (double ***a, int n, int m);//用三级指针接收二维数组的地址 
void InputArr(double **a, int n, int m);
void OutputArr (double **a, int n, int m);
void DestoryArr (double ***a);

int main()
{
	int n, m;
	double **a;//二级指针 
	scanf("%d%d", &n, &m);
	CreatArray(&a, n, m);
	InputArr(a, n, m);
	OutputArr(a, n, m); 
	DestoryArr(&a);
	
	return 0;
}

void CreatArray (double ***a, int n, int m)
{
	int i;
	*a = (double**)malloc(n * sizeof(double*));
	(*a)[0] = (double*)malloc(m * n * sizeof(double));//创建 n * m个double空间 
	
	for (i = 1; i < n; ++i)
	{
		(*a)[i] = (*a)[i - 1] + m;//每行的行指针的地址相隔m个double空间 
	} 
}

void InputArr(double **a, int n, int m)
{
	int i, j;
	for (i = 0; i < n; ++i)
	{
		for (j = 0; j < m; ++j)
		{
			scanf("%lf", &a[i][j]);
		}
	}
}

void OutputArr (double **a, int n, int m)
{
	int i, j;
	for (i = 0; i < n; ++i)
	{
		for (j = 0; j < m; ++j)
		{
			printf("%-6.2f", a[i][j]);
		}
		putchar('\n');
	}
}

void DestoryArr (double ***a)
{
	free(*(a)[0]);
	free(*a);
	*a = NULL;
}