Exercise 2: Write a console application and ask the user to enter five uppercase letters. If the information entered by the user does not meet the requirements, prompt the help information and re-enter the information.

Write a console applicationProgramThe user is required to enter five upper-case letters. If the information entered by the user does not meet the requirements, the user is prompted for help information and must be re-entered.

 

[Answer]

 

Using system; <br/> using system. collections. generic; <br/> using system. text; <br/> namespace inputcapitalletter <br/>{< br/> class Program <br/>{< br/> static void main () <br/>{< br/> bool OK = false; <br/> while (OK = false) <br/>{< br/> console. write ("Enter five uppercase letters:"); <br/> string STR = console. readline (); <br/> If (Str. length! = 5) <br/>{< br/> console. writeline ("the number of characters you entered is not 5. Please enter again. "); <Br/>}< br/> else <br/>{< br/> OK = true; <br/> for (INT I = 0; I <5; I ++) <br/>{< br/> char c = STR [I]; <br/> If (C <'A' | C> 'Z') <br/>{< br/> console. writeline ("the {0} character" {1} "is not an uppercase letter. Please enter it again. ", I + 1, C); <br/> OK = false; <br/> break; <br/>}< br/>}