A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0-9

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Unbuffered Input (direct input) - "Means that the characters the user types are immediately made available to the waiting program." (Prata 269)

References

Stephen Prata, C Primer Plus (2001) p.269