printf("False: empty string %s\n", (3 < 2));
printf("True (Relational):  %d \n", (3 > 1));
if (!0) {
   printf("Zero is false\n");
}
if (-16) { 
   printf("Non-Zero is true\n");
}

False: empty string 
True (Relational):  1 
Zero is false
Non-Zero is true