Question
The printable ASCII characters extend from the blank space character ' ' (which has code 32 decimal) to the tilde character '~' (which has code
The printable ASCII characters extend from the blank space character ' ' (which has code 32 decimal) to the tilde character '~' (which has code 126 decimal). The characters with codes in the range 0 to 31 and also code 127 are non-printable "control characters".
When entering characters at the command line to determine the character range we want in the output, we need to be very careful how we enter some characters. These include the blank space character and some others that are treated as "meta characters" by the operating system, and are thus not passed to the program for processing. To avoid this problem we will place each character entered at the command line within double quotes. The " and \ characters must (as usual) be escaped within their enclosing double quotes, and so must the backtick character (the `).
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