编写程序计算键盘输入的字符串中空白字符、数字、和英文字母的个数各是多少。 编写程序，将从键盘输入的字符串中的最后m个字符与最前面的m个字符交换位置。含实验报告-Write the program to calculate the number of blank characters, numbers, and English letters in the string entered by the keyboard. Write a program that will swap the last m characters in the string entered　the keyboard with the first m characters. Including experimental report