C Reference Printing Character: isprint()

The function isprint() returns a non-zero if its argument is a printable character (including a white-space). If the argument is not a printable character (like the newline character ‘\n’ ) , then zero is returned.

isprint() source code example:

#include<stdio.h>
#include<ctype.h>

int main()
{
	int counter=0;
	char str[]="line one \n line two \n line three \n";

	while (isprint(str[counter]))
	{
		putchar (str[counter]);
		counter++;
	}
	return 0;
}

Note: will only print line one, because the newline character is not printable.