Name a Status with enum

A loan record can be stored or borrowed. Naming those states with enum State makes state == BORROWED clearer than testing an unexplained number. With no explicit values, STORED is 0 and BORROWED is 1. An enum variable can still hold other integer values in C, so check values that come from outside the program.

#include <stdio.h>
enum State { STORED, BORROWED };
int main(void) {
    enum State state = BORROWED;
    printf("Borrowed: %d\n", state == BORROWED);
    return 0;
}

The comparison is true, so the program prints Borrowed: 1. Change the initial state to STORED and run it again to see the false case.