How do you open and read external data (ASCII file – text file) like list of exam score by using fscanf or textscan or any other functions? Example) 99 80 76

Full Implementation (user input in red) Welcome to the Caesar Cipher This program encrypts and decrypts text using Caesar Cipher. Would you like to encrypt (e) or decrypt (d): d Would you like to read from a file (f) or the console (c)? c What message would you like to decrypt: LIPPS ASVPH What is the shift number: 4 HELLO WORLD Would you like to encrypt or decrypt another message? (y/n): y Would you like to encrypt (e) or decrypt (d): e Would you like to rea from a file (f) or the console What message would you like to encrypt: Hello World What is the shift number: 4 (c) ? c LIPPS ASVPH Would you like to encrypt or decrypt another message? (y/n): y Would you like to encrypt (e) or decrypt (d): e Would you like to read from a file (f) or the console (c) ? f Enter a filename: something_silly.txt Invalid Filename Enter a filename: messages.txt What is the shift number: 4 6 Output written to results.txt Would you like to encrypt or decrypt another message? (y/n): n Thanks for using the…