Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    int flag=0;
    unsigned short x=(*cfg).reg;
    if(x&(1<<0)!=0){
        int y=(x >> 2) & 0x3;
        if(y==3){
            return 0;
        }
        else{
            for(int i=4;i<16;i++){
                int t=x&(1<<i);
                if(t!=0){
                    flag=1;
                    break;
                }
            }
        }
    if(flag==1){
        return 0;
    }
    else{
        return 1;
    }
    }
    else{
        return 0;
    }
}

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

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

    return 0;
}

Solving Approach