Create a function named valid_input to return the valid character entered by the user. The function will perform the following: • Accept only a character from the user. • Perform validation using appropriate functions (e.g. isdigit). For instance, if the user enters a digit, display "Digit is not allowed". • If the user enters lower case character (e.g. 'a'), it will convert the input to upper case (e.g. 'A'). • If the user enters character other than S, Q, P or E, it displays "Please enter only S, Q. P or E". • Displays appropriate message and prompts for input again until the user enters the desired option.

Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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By using c++ programming language, please provide the source code and output thanks.

Create a function named valid_input to return the valid character entered by the user.
The function will perform the following:
• Accept only a character from the user.
• Perform validation using appropriate functions (e.g. isdigit). For instance, if the
user enters a digit, display "Digit is not allowed".
If the user enters lower case character (e.g. 'a'), it will convert the input to upper
case (e.g. 'A').
• If the user enters character other than S, Q, P or E, it displays "Please enter only S,
Q, P or E".
• Displays appropriate message and prompts for input again until the user enters the
desired option.
Transcribed Image Text:Create a function named valid_input to return the valid character entered by the user. The function will perform the following: • Accept only a character from the user. • Perform validation using appropriate functions (e.g. isdigit). For instance, if the user enters a digit, display "Digit is not allowed". If the user enters lower case character (e.g. 'a'), it will convert the input to upper case (e.g. 'A'). • If the user enters character other than S, Q, P or E, it displays "Please enter only S, Q, P or E". • Displays appropriate message and prompts for input again until the user enters the desired option.
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