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 value = cfg->reg; 
    int var_1 = value & 0x01;
    int var_2 = (value >> 2) & 0x03;
    int var_3 = (value >> 4);
    
    if(var_1 == 1 && var_2 != 3 && var_3 == 0){
        return 1;
    }

    return 0;
}

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

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

    return 0;
}