说明：  简单的数据结构，随便弄的 字符串空格删除。编写一个删除字符串中所有空格（包括TAB符，回车符，换行符等）的程序。 字符串的连接。输入两个字符串s1、s2，将字符串s1、s2中每个小写字母转换为大写字母，再将s2字符串连接到s1串的尾部。 字符串的比较。输入两个字符串s1、s2，比较字符串s1、s2的大小。 数制转换。编写一个将16进制数字串转换成10进制整数的程序。要求从键盘上输入字符串，然后进行转换。
(Simple data structure, just get the string to delete spaces. The preparation of a deletion of a string of all spaces (including TAB characters, carriage returns, tabs, newlines, etc.) procedures. The connection string. Enter the two strings s1, s2, string s1, s2 of each lowercase letters converted to uppercase letters, and then the string s2 is connected to the tail of string s1. String comparison. Enter the two strings s1, s2, compare string s1, s2 size. Number System Conversion. The preparation of a 16-string converted to hexadecimal figures 10 hexadecimal integer procedure. Request from the keyboard input string, and then convert.)