77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    if (
        ((cfg -> reg) & 0x01) &&
        ((((cfg -> reg) >> 2) & 0x03) < 3) &&
        (((cfg -> reg) >> 4) == 0) 
        ) {
            return 1;
        }
        
    return 0;
}

int main() {
    ConfigRegister cfg;
    scanf("%hx", &cfg.reg);

    int result = validate_config(&cfg);
    printf("%d", result);

    return 0;
}