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 enable = ((cfg->reg) >> 0 & 0x1 == 1) ? 1 : 0;
    int priority = ((cfg->reg) >> 2 & 0x03 == 1) ? 0 : 1;
    int reservered = ((cfg->reg & 0xFFF0) == 0) ? 1 : 0;

    if(enable && priority && reservered)
    return 1;

    return 0;
}

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

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

    return 0;
}