Validate Configuration Register Layout

Code

#include <stdio.h>
#include <stdint.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    uint16_t val = cfg->reg;
    if ((val & 1) == 0){
        return 0;
    }

    if (((val >> 2) & 0x3) == 0x3){
        return 0;
    }

    if (val & 0xFFF0){
        return 0; 
    }
    // Write logic using pointer access
    return 1;
}

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

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

    return 0;
}

Solving Approach