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C LIBRARY FUNCTIONS->Detailed Descriptions->isgraph()
|int isgraph(int c);||Test for printable character not including the space character (0X21 - 0X7E)|
c Integer to be tested
This function tests the integer passed to it to see if it is a graphical character:
0X21 - 0X7E.
TRUE (1) is returned if the character is graphical, otherwise FALSE (0) is returned.