程序代码：

#include<stdio.h>
int ** getMatrix(int rows, int cols)
{
    int i;
    int **p;
    p = (int **)malloc(rows * sizeof(int *));
    for(i = 0; i < rows; i++)
        p[i] = (int *)malloc(cols * sizeof(int));
    return p;
}
void deleteMatrix(int **p, int rows)
{
    int i;
    for(i = 0; i < rows; i++) free(p[i]);
    free(p);
}
int main()
{
    int **p, i, j, rows, cols;
    rows = 5;
    cols = 5;
    p = getMatrix(rows, cols);
    for(i = 0; i < rows; i++)
        for(j = 0; j < cols; j++)
            p[i][j] = i * rows + j;
    for(i = 0; i < rows; i++)
    {
        for(j = 0; j < cols; j++)
            printf("%5d", p[i][j]);
        printf("\n");
    }
    deleteMatrix(p, rows);
    return 0;
}