77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    int check1 = (cfg->reg) & 1U;
    int check2 = ((cfg->reg) >> 2) & 0x03;
    int check3 = ((cfg->reg) & ~0x0F) >> 4;

    if((check1) && (check2 != 0x03) && ((check3 & 0x0FFF) == 0)){
        return 1;
    }
    
    return 0;
}

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

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

    return 0;
}