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 int c1 = (cfg->reg)&1;
    unsigned int c2 = ((cfg->reg)>>2)&3;
    unsigned int c3 = ((cfg->reg)>>4);

    return c1 && (c2 < 3) && (c3 == 0);
}

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

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

    return 0;
}