USEFUL FUNCTIONS

/* HOW MANY DIGITS HAS A NUMBER - CUÁNTOS DIGITOS TIENE UN NÚMERO */
int digits(int n) {
    int d=1;
    while (n/10!=0) {
        n/=10;
        d++;
    }
    return d;}



/* EVEN NUMBER - NÚMERO PAR */
bool isEven(int n) {
    if(n%2==0) return true;
    else return false;}



/* PRIME NUMBER - NÚMERO PRIMO */
bool prime(int num){
     if(num==0 or num==1)
        return 0;
    for (int i=2;i*i<=num;++i){
        if (num%i==0)
            return false;
    }
    return true;}



/* CONVERT DECIMAL TO BINARY */
int dec_to_bin(int n)
{
    int binaryNumber = 0;
    int remainder, i = 1, step = 1;

    while (n!=0)
    {
        remainder = n%2;
        n /= 2;
        binaryNumber += remainder*i;
        i *= 10;
    }
    return binaryNumber;
}



/* CONVERT DECIMAL TO BINARY IN Ca2 (6 bits) */
int dec_to_ca2_6bits(int n)
{
    int n2=n;
    if (n<0) n2=64+n;
    int binaryNumber = 0;
    int remainder, i = 1, step = 1;

    while (n2!=0)
    {
        remainder = n2%2;
        n2 /= 2;
        binaryNumber += remainder*i;
        i *= 10;
    }
    return binaryNumber;
}


/* CONVERT BINARY TO DECIMAL */
int bin_to_dec(int n)
{
    int decimalNumber = 0, i = 0, remainder;
    while (n!=0)
    {
        remainder = n%10;
        n /= 10;
        decimalNumber += remainder*pow(2,i);
        ++i;
    }
    return decimalNumber;
}