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@ -8,16 +8,30 @@ fn print_number(maybe_number: Option<u16>) {
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println!("printing: {}", maybe_number.unwrap());
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}
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fn main() {
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print_number(13);
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print_number(99);
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// This function returns how much icecream there is left in the fridge.
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// If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them
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// all, so there'll be no more left :(
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// TODO: Return an Option!
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fn maybe_icecream(time_of_day: u16) -> Option<u16> {
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// We use the 24-hour system here, so 10PM is a value of 22
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???
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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let mut numbers: [Option<u16>; 5];
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for iter in 0..5 {
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let number_to_add: u16 = {
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((iter * 1235) + 2) / (4 * 16)
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};
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#[test]
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fn check_icecream() {
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assert_eq!(maybe_icecream(10), Some(5));
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assert_eq!(maybe_icecream(23), None);
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assert_eq!(maybe_icecream(22), None);
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}
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numbers[iter as usize] = number_to_add;
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#[test]
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fn raw_value() {
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// TODO: Fix this test. How do you get at the value contained in the Option?
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let icecreams = maybe_icecream(12);
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assert_eq!(icecreams, 5);
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}
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}
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