77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;//an unsigned short integer (usually 16 bits)// ‘uint16_t’ is defined in header ‘<cstdint>’;
} ConfigRegister;





int validate_config(ConfigRegister *cfg) {

  unsigned short buffer = (*cfg).reg;
  
   if(buffer & 0x0001 != 1)
        return 0;

    unsigned short prority = (buffer>>2)&0x3;
   if(prority ==3)// 11 is invalid
        return 0;


    if(buffer & 0xFFF0)
        return 0;

    return 1;
}







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

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

    return 0;
}