学步园

//dynamically assign int array M * N

//use C
int **array = NULL;
array = (int **)malloc(M * sizeof(int *));
for(int i = 0; i < M; ++i)
{
    array[i] = (int *)malloc(N * sizeof(int));
}

//free the malloced memory

for(int i = 0; i < M; ++i)
{
    free(array[i]);
}
free(array);


//use C++

int **array = NULL;
array = new int *M;
for(int i = 0; i < M; ++i)
{
    array[i] = new int[N];
}

//delete the new memory
for(int i = 0; i < M; ++i)
{
    delete [] array[i];
}
delete []array;