Web Reference: Mar 3, 2025 · Checks if the given character has a graphical representation, i.e. it is either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz), or a punctuation character (!"#$%&' ()*+,-./:;?@ [\]^_` {|}~), or any graphical character specific to the current C locale. Oct 24, 2017 · The C library function isgraph () checks whether a character is a graphic character or not. Characters that have graphical representation are known are graphic characters. Determines whether an integer represents a graphical character.
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