Whether or not c is a printable character - including the space character.
1 assert( isPrintable(' ')); // whitespace is printable 2 assert( isPrintable('1')); 3 assert( isPrintable('a')); 4 assert( isPrintable('#')); 5 assert(!isPrintable('\0')); // control characters are not printable 6 7 // N.B.: Printable non-ASCII Unicode characters are not recognized. 8 assert(!isPrintable('á'));