LESSON 174 OF 414 · PROJECTS: EVERYDAY PROGRAMS

Password Strength V4 - Count Character Classes in Rust

Practice

Count how many characters of each class the password contains.

You start with:

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

let 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.is_ascii_uppercase(), c.is_ascii_lowercase(), c.is_ascii_digit(), c.is_ascii_alphanumeric() with += 1.

let password = "Hello!World9";

let mut uppercase = 0;
let mut lowercase = 0;
let mut digits = 0;
let mut symbols = 0;
for character in password.chars() {
    if character.is_ascii_uppercase() {
        uppercase += 1;
    }
    if character.is_ascii_lowercase() {
        lowercase += 1;
    }
    if character.is_ascii_digit() {
        digits += 1;
    }
    if !character.is_ascii_alphanumeric() {
        symbols += 1;
    }
}
println!("Uppercase: {}", uppercase);
println!("Lowercase: {}", lowercase);
println!("Digits: {}", digits);
println!("Symbols: {}", symbols);

STEP 1 OF 14

Guided

Ctrl + Enter to check

Password Strength V4 - Count Character Classes in Rust

Password Strength V4 in Rust