<Li> An escape sequence, as in C / C++ character string codes: \ a, \ 007, \ x07, etc . </Li> <P> ASCII - based keyboards have a key labelled "Control", "Ctrl", or (rarely) "Cntl" which is used much like a shift key, being pressed in combination with another letter or symbol key . In one implementation, the control key generates the code 64 places below the code for the (generally) uppercase letter it is pressed in combination with (i.e., subtract 64 from ASCII code value in decimal of the (generally) uppercase letter). The other implementation is to take the ASCII code produced by the key and bitwise AND it with 31, forcing bits 6 and 7 to zero . For example, pressing "control" and the letter "g" or "G" (code 107 in octal or 71 in base 10, which is 01000111 in binary, produces the code 7 (Bell, 7 in base 10, or 00000111 in binary). The NULL character (code 0) is represented by Ctrl - @, "@" being the code immediately before "A" in the ASCII character set . For convenience, a lot of terminals accept Ctrl - Space as an alias for Ctrl - @ . In either case, this produces one of the 32 ASCII control codes between 0 and 31 . This approach is not able to represent the DEL character because of its value (code 127), but Ctrl -? is often used for this character, as subtracting 64 from a'?' gives − 1, which if masked to 7 bits is 127 . </P> <P> When the control key is held down, letter keys produce the same control characters regardless of the state of the shift or caps lock keys . In other words, it does not matter whether the key would have produced an upper - case or a lower - case letter . The interpretation of the control key with the space, graphics character, and digit keys (ASCII codes 32 to 63) vary between systems . Some will produce the same character code as if the control key were not held down . Other systems translate these keys into control characters when the control key is held down . The interpretation of the control key with non-ASCII ("foreign") keys also varies between systems . </P> <P> Control characters are often rendered into a printable form known as caret notation by printing a caret (^) and then the ASCII character that has a value of the control character plus 64 . Control characters generated using letter keys are thus displayed with the upper - case form of the letter . For example, ^ G represents code 7, which is generated by pressing the G key when the control key is held down . </P>

What is the position of n character in ascii code