t.c

#include <stdio.h>

int
main(int argc, char **argv)
{
	unsigned char uc =  1;
	signed   char sc = -1;
	unsigned int  ui =  1;
	signed   int  si = -1;
	unsigned long ul =  1;
	signed   long sl = -1;
	(void)printf("char: %s\n", (sc < uc) ? "yes" : "no");
	(void)printf("int:  %s\n", (si < ui) ? "yes" : "no");
	(void)printf("long: %s\n", (sl < ul) ? "yes" : "no");
	return 0;
}

char: yes
int:  no
long: no