What are in C the values of TRUE and FALSE?

/* true.c  -- What are in C the values of TRUE and FALSE? 
*/

#include <stdio.h>

int main(void) {
printf("The value of 1<2 is %d\n", (1<2));
printf("The value of 2<1 is %d\n", (2<1));
}

/* The program prints out

The value of 1<2 is 1
The value of 2<1 is 0

*/