题目20 顺时针打印矩阵

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// 2. 题目20 顺时针打印矩阵
// 输入一个矩阵，按照从外向里以顺时针依次打印出每个数字！！！

void PrintMatirxInCircle(int(*ppArray)[4], int iRows, int iColumns, int iStart)
{
    int iEndX = iColumns - 1 - iStart;
    int iEndY = iRows - 1 - iStart;

    // 1.从左到右打印一行
    for (int i = iStart; i <= iEndX; i++)
    {
        printf("%2d ", ppArray[iStart][i]);
    }

    // 2.从上到下打印一列
    if (iStart < iEndY)
    {
        for (int i = iStart + 1; i < iEndY; i++)
        {
            printf("%2d ", ppArray[i][iEndX]);
        }
    }

    // 3.从右到左打印一行
    if (iStart < iEndX && iStart < iEndY)
    {
        for (int i = iEndX - 1; i >= iStart; i--)
        {
            printf("%2d ", ppArray[iEndY][i]);
        }
    }

    // 4.从下到上打印一行
    if (iStart < iEndX && iStart < iEndY - 1)
    {
        for (int i = iEndY - 1; i >= iStart + 1; i--)
        {
            printf("%2d ", ppArray[i][iStart]);
        }
    }
}

void PrintMatirxClockwisely(int (*ppArray)[4], int iRows, int iColumns)
{
    if (NULL == ppArray || iRows <= 0 || iColumns <= 0)
    {
        return;
    }

    int iStart = 0;
    while (iColumns > iStart * 2 && iRows > iStart * 2)
    {
        // 打印一圈数据
        PrintMatirxInCircle(ppArray, iRows, iColumns, iStart);

        iStart++;
    }
}

void PrintMatirxTestFunc()
{
    cout << "\n\n --------------- PrintMatirxTestFunc Start -------------->" << endl;
    int aiArray[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};

    PrintMatirxClockwisely(aiArray, 4, 4);

    cout << "\n\n --------------- PrintMatirxTestFunc End -------------->" << endl;

}