变量n 的值为10。从键盘输入一个字符，当输入的字符为’!’时，计算

n!；当字符为’p’时，计算3 的n 次幂。循环输入字符，当输入’q’时，退出程序。-Variable n has a value of 10. Enter a character from the keyboard when the input character is　! , The calculation

n!　when the character is　p , the calculation of the n-th power 3. Loop input character, when the input　q　when exiting the program.