mirror of https://github.com/rust-lang/rustlings
Add some exercises about functions!
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// Make me compile! Scroll down for hints :)
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fn main() {
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call_me();
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}
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// This main function is calling a function that it expects to exist, but the
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// function doesn't exist. It expects this function to have the name `call_me`.
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// It expects this function to not take any arguments and not return a value.
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// Sounds a lot like `main`, doesn't it?
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// Make me compile! Scroll down for hints :)
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fn main() {
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call_me(3);
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}
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fn call_me(num) {
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for i in 0..num {
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println!("Ring! Call number {}", i + 1);
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}
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}
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// Rust requires that all parts of a function's signature have type annotations,
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// but `call_me` is missing the type annotation of `num`.
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// Make me compile! Scroll down for hints :)
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fn main() {
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call_me();
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}
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fn call_me(num: i32) {
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for i in 0..num {
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println!("Ring! Call number {}", i + 1);
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}
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}
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// This time, the function *declaration* is okay, but there's something wrong
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// with the place where we're calling the function.
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@ -0,0 +1,43 @@
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// Make me compile! Scroll down for hints :)
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// This store is having a sale where if the price is an even number, you get
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// 10 (money unit) off, but if it's an odd number, it's 3 (money unit) less.
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fn main() {
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let original_price = 51;
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println!("Your sale price is {}", sale_price(original_price));
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}
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fn sale_price(price: i32) -> {
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if is_even(price) {
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price - 10
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} else {
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price - 3
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}
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}
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fn is_even(num: i32) -> bool {
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num % 2 == 0
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}
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// The error message points to line 10 and says it expects a type after the
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// `->`. This is where the function's return type should be-- take a look at
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// the `is_even` function for an example!
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