77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    int a=cfg->reg&((1U<<1)-1);
    int b=(cfg->reg>>2)&((1U<<2)-1);
    int c=(cfg->reg>>4)&((1U<<12)-1);
    if(a==1&&b!=3&&c==0){
        return 1;
    }
    return 0;
}

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

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

    return 0;
}