77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    unsigned int reg = cfg->reg;
    if((reg&1)==0){

        return 0;

    }
    
    if(((reg>>2)&0x3)==3){
        
        return 0;
    }
  
    if((reg&0xfff0)!=0){
return 0;
    }
    return 1;
}


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

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

    return 0;
}