text: #include <ctype.h>
  
  int isspace(char c)
  {
  	char comp[] = {' ', '\t', '\n', '\r', '\v', '\f'};
  	int i;
  	const int len = 6;
  	for (i = 0; i < len; i++) {
  		if (c == comp[i])
  			return 1;
  	}
  	return 0;
  }
  