LESSON 170 OF 413 · PROJECTS: EVERYDAY PROGRAMS

Password Strength V4 - Count Character Classes in C#

Practice

Count how many characters of each class the password contains.

You start with:

string password = "Hello!World9";

Build:

Uppercase: 2
Lowercase: 8
Digits: 1
Symbols: 1

Rules:

Use four integer counters, all starting at 0.
Loop through each character and add 1 to the matching counter.
Treat any character that is not a letter and not a digit as a symbol.
Print one line per counter, in this order: "Uppercase: ", "Lowercase: ", "Digits: ", "Symbols: ", each followed by the count.

Try other passwords: with Pass word!2 the output is

Uppercase: 1
Lowercase: 7
Digits: 1
Symbols: 2

char.IsUpper, char.IsLower, char.IsDigit, char.IsLetterOrDigit, with ++ counters.

string password = "Hello!World9";

int uppercase = 0;
int lowercase = 0;
int digits = 0;
int symbols = 0;
foreach (char c in password) {
    if (char.IsUpper(c)) {
        uppercase++;
    }
    if (char.IsLower(c)) {
        lowercase++;
    }
    if (char.IsDigit(c)) {
        digits++;
    }
    if (!char.IsLetterOrDigit(c)) {
        symbols++;
    }
}
Console.WriteLine("Uppercase: " + uppercase);
Console.WriteLine("Lowercase: " + lowercase);
Console.WriteLine("Digits: " + digits);
Console.WriteLine("Symbols: " + symbols);

STEP 1 OF 13

Guided

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Password Strength V4 - Count Character Classes in C#

Password Strength V4 in C#