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 & 0x1) == 1) && 
    (( (cfg->reg>>2) & 0xB) != 11) && 
    (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;
}