You are creating a new account on a website and need to come up with a username. The username has the following requirement:

1) The username has at least 5 characters, and at most 10 characters

2) It must contain alphabetic letters (upper or lower case), digit or underscore, but no

space or other punctuations.

For example, mike_FL is valid and mike!FL is invalid

Write a program that takes a word entered by the user, check if the word is a valid username. If the input is valid, print a confirmation statement. If it is not, print a statement that the input is not valid.

1) Name your program username.c.

2) The user input ends with the user pressing the enter key (a new line character).

3) Use getchar() to read in the input.

4) You can use character handling functions such as isdigit and isalpha. Dont forget

to include ctype.h if you use any character handling functions.

Before you submit

1. Compile program with Wall. Wall shows the warnings by the compiler. Be sure it compiles on student cluster with no errors and no warnings.