接收从键盘输入的字符串（字符串中包含数字、大写字符、小写字符及标点符号等等，字符串以回车符作为结束符），编写程序将其中的小写字符转换成大写字符，然后将转换后的字符串显示在屏幕上。-Receiving (string contains numbers, uppercase characters, lowercase characters and punctuation marks, etc., as the end string carriage return character)　a string of keyboard input, write a program in which lowercase characters to uppercase characters, and then the converted string is displayed on the screen.