Good password or not Program

[gethelpcpp123]

A password is good if it has at least one digit,one alphanumeric charecter, one uppercase letter, one ordinary lowercase letter letter and consists of 8 charecters or more. I created this program, but I'm not getting correct results.. What is the problem?

void main()
{
cout<<"This program checks whether the password entered by the user is good or not"<<endl;
cout<<"Enter the password"<<endl;
char password[100];
int atleastoneDigit=0,atleastoneLowercaseletter=0,atleastoneUppercaseletter=0,atleastonealphanumericCharecter=0;
cin>>password;
int length=strlen(password);
for(int i=0;i<length;i++)
{
if(password[i]>=33&&password[i]<=58)//ASCII values for uppercase letters
atleastoneUppercaseletter++;

else if(password[i]>=65&&password[i]<=90)
        atleastoneLowercaseletter++;
else if(password[i]>=16&&password[i]<=25)
    atleastoneDigit++;
else
atleastonealphanumericCharecter++;

}

    if(length>=8&&atleastoneDigit!=0&&atleastoneUppercaseletter!=0&&atleastoneLowercaseletter!=0&&atleastonealphanumericCharecter!=0)
        cout<<"This is a good password!"<<endl;
    else
        cout<<"This is not a good password!"<<endl;

}

[wildplace]

what if you check it this way..

hasAlpha...hasLower are boolean
pw is string...

for(int i=0; i<pw.length(); i++){
    if(isalpha(pw[i]))
        hasAlpha = true;
    if(isdigit(pw[i]))
        hasDigit=true;
    if(isupper(pw[i]))
        hasUpper =true;
    if(islower(pw[i]))
        hasLower = true;
    }

[Milton Neal]

Check your ascii values.
Digits are decimal 48 to 57.
If the password contains alpha characters (a->z, A->Z)and numeric(0->9) characters it is then refered to as alphanumeric.

Cheers
Milton

[WaltP]

Expanding on MNeal's post, stop using magic numbers. If you want to test for the character 'A', use 'A', not 65. Zero is '0', not 48.