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 temp=cfg->reg;
       if ( ((temp & 0x0001) != 0) &&(((temp >> 2) & 0x0003) != 3) && ((temp >> 4) == 0) )              // bits 4-15 = 0
    {
           return 1;
    }
    else
    {
        return 0;
    }
}

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

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

    return 0;
}