LESSON 171 OF 414 · PROJECTS: EVERYDAY PROGRAMS

Password Strength V4 - Count Character Classes in Kotlin

Practice

Count how many characters of each class the password contains.

You start with:

val 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

c.isUpperCase(), c.isLowerCase(), c.isDigit(), c.isLetterOrDigit(), with ++ counters.

val password = "Hello!World9"

var uppercase = 0
var lowercase = 0
var digits = 0
var symbols = 0
for (c in password) {
    if (c.isUpperCase()) {
        uppercase++
    }
    if (c.isLowerCase()) {
        lowercase++
    }
    if (c.isDigit()) {
        digits++
    }
    if (!c.isLetterOrDigit()) {
        symbols++
    }
}
println("Uppercase: " + uppercase)
println("Lowercase: " + lowercase)
println("Digits: " + digits)
println("Symbols: " + symbols)

STEP 1 OF 13

Guided

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Password Strength V4 - Count Character Classes in Kotlin

Password Strength V4 in Kotlin