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) == 1 && 
       (((cfg->reg & 0x04) != 1) && ((cfg->reg & 0x08) != 1)) &&
       ((cfg->reg & 0xfff0) == 0)
        ) 
        return 1;
    return 0;
}

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

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

    return 0;
}