Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    int retVal = 0;
    if (((cfg->reg & 0x1) == 1) && (((cfg->reg >> 2) & 0x3) != 0x3) && ((cfg->reg >> 4) == 0))
    {
        retVal = 1;
    }

    return retVal;
}

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

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

    return 0;
}

Solving Approach