Game skeleton

Set up the guessing game welcome screen with main and println!.

Guessing game: the plan

In this project we build the classic number guessing game step by step: the program picks a secret number from 1 to 100, the player enters a guess, the program says "too small", "too big" or "you got it", and it repeats until the player gets it. The pieces we'll use: input with stdin, converting to a number with parse, comparing with cmp and Ordering, and repeating with loop.

$ cargo new tahmin_oyunu
$ cd tahmin_oyunu
$ cargo run

The skeleton

The first version only prints the welcome text. use std::io; will be needed for reading input; we add it now:

use std::io;

fn main() {
    println!("Sayıyı tahmin et!");
    println!("Tahminini gir:");
}

An unused use causes the compiler's "unused import" warning; it isn't an error, and we'll use it in the next step.

Exercise Welcome

Write the game skeleton: print the lines "Sayıyı tahmin et!" and "Tahminini gir:" in order.

Show example solution

fn main() {
    println!("Sayıyı tahmin et!");
    println!("Tahminini gir:");
}

Test yourself

Which file does <code>cargo new tahmin_oyunu</code> create?
- index.rs
- src/lib.c
- src/main.rs
- main.go
Show answer

src/main.rs — cargo new sets up a binary project: Cargo.toml and src/main.rs with a hello world.

The input module

use std::____;

fn main() {
    println!("Sayıyı tahmin et!");
}

Show answer

use std::io;

fn main() {
    println!("Sayıyı tahmin et!");
}

Command and its job

cargo new

Creates a project
cargo run

Builds and runs
cargo check

Only checks
cargo build --release

Builds optimized

Next lesson: Reading input

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