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 short A = cfg->reg;
    unsigned short mask = 1;
    unsigned short res,res2,res3;

    res = mask & A;
    mask = 0xC;
    res2 = mask & A;
    mask = 0XFFF0;
    res3 = mask & A;
    if(res== 1 && res2 != 0XC && res3 == 0){
        return 1;

    }

    else {return 0;}
    
}

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

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

    return 0;
}