LESSON 173 OF 414 · PROJECTS: EVERYDAY PROGRAMS

Password Strength V3 - Character Classes in Rust

Practice

Track four boolean flags for a password: does it contain an uppercase letter, a lowercase letter, a digit, and a symbol (non-alphanumeric)?

You start with:

The Rust editor starts empty, so write the whole program yourself. Begin with the data:

let password = "Secret!99";

Build:

Length: 9
Upper: True
Lower: True
Digit: True
Symbol: True
Strong

Rules:

Print "Length: " followed by the number of characters.
Start four flags (has_upper, has_lower, has_digit, has_symbol) at false. Loop over every character and set the matching flag to true.
A symbol is any character that is not a letter and not a digit.
Print one line per flag, in this order: "Upper: ", "Lower: ", "Digit: ", "Symbol: ", each followed by the flag. Write it as True or False with a capital letter, exactly as in the example (your language's own boolean prints differently, so choose the text yourself).
If the length is at least 8 and all four flags are true (stricter than the last lesson), print Strong; otherwise print Weak.

Try other passwords: with secret99 the output is

Length: 8
Upper: False
Lower: True
Digit: True
Symbol: False
Weak

Use c.is_ascii_uppercase(), c.is_ascii_lowercase(), c.is_ascii_digit(), c.is_ascii_alphanumeric().

let password = "Secret!99";

let length = password.len();
println!("Length: {}", length);
let mut has_upper = false;
let mut has_lower = false;
let mut has_digit = false;
let mut has_symbol = false;
for character in password.chars() {
    if character.is_ascii_uppercase() {
        has_upper = true;
    }
    if character.is_ascii_lowercase() {
        has_lower = true;
    }
    if character.is_ascii_digit() {
        has_digit = true;
    }
    if !character.is_ascii_alphanumeric() {
        has_symbol = true;
    }
}
println!("Upper: {}", if has_upper { "True" } else { "False" });
println!("Lower: {}", if has_lower { "True" } else { "False" });
println!("Digit: {}", if has_digit { "True" } else { "False" });
println!("Symbol: {}", if has_symbol { "True" } else { "False" });
if length >= 8 && has_upper && has_lower && has_digit && has_symbol {
    println!("Strong");
} else {
    println!("Weak");
}

STEP 1 OF 14

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Password Strength V3 - Character Classes in Rust

Password Strength V3 in Rust