4×4键盘完美扫描程序，方便、简洁。具体为矩阵是键盘，请各位高手多多指教。

螺旋矩阵的实现，从键盘输入一个整数（1~20） 则以该数字为矩阵的大小，把1,2,3…n*n 的数字按照顺时针螺旋的形式填入其中-Spiral Matrix in, enter an integer from the keyboard (1 ~ 20) are indicated in the figure for the size of the matrix, the 1,2,3 ... n* n the number of forms filled in accordance with

矩阵的乘法运算：键盘输入两个矩阵，计算其乘积。-This program can gets the product of two matrixes.

从键盘输入矩阵，并实现矩阵相乘切从屏幕输出。-Entered from the keyboard matrix to achieve the matrix multiplication cut from the output of the screen.