C Reference Control Character Test: iscntrl()

The iscntrl() function returns a non-zero if its argument is a control character. If there is no control character encountered, then zero is returned.

iscntrl() source code example:


int main()
	int counter=0;

	char str[]="line one \n line two \n line three \n";
	while (!iscntrl(str[counter]))
		putchar (str[counter]);

	return 0;

Note: Only line one is printed because after line one there is a control character ‘\n’ (ASCII code 0x0a)

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