c/c++创建二维数组

设创建一个int a[3][4];

c创建二维数组

　　 int **ptr;
    ptr = (int **) malloc(3*sizeof(int*));
    int i;
    for(i = 0; i < 3; i++)
    {
        ptr[i] = (int *)malloc(4*sizeof(int));
    }

    int j;
    for(i = 0; i < 3; i++)
    {
        for(j = 0; j < 4; j++)
        {
            ptr[i][j] = i+j;
            printf("%d ", ptr[i][j]);
        }
        printf("\n");
    }
    for(i = 0 ; i < 3; i++)
    {
        free(ptr[i]);
    }
    free(ptr);

c++创建二维数组

    int **a;
    a = new int*[3];

    int i, j;
    for(i = 0; i < 3; i++)
    {
        a[i] = new int[4];
    }

    for(i = 0; i < 3; i++)
    {
        for(j = 0; j < 4; j++)
        {
            a[i][j]=i+j;
            cout << a[i][j] << " ";
        }
        cout << endl;
    }

    for(i = 0; i < 3; i++)
    {
        delete []a[i];
    }
    delete []a;