77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    int n = (cfg -> reg) & 1;
    int p = ((cfg -> reg) & ((1<<2)|(1<<3))) >> 2;
    int temp = ((cfg -> reg) & (0xFFF << 4)) >> 4;
    
    if((n==1) && (p >= 0 && p < 3) && (temp==0)){
        return 1;
    }
    else{
        return 0;
    }
}

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

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

    return 0;
}