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20 lines
505 B
20 lines
505 B
// Problem 1:
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// If we list all the natural numbers below 10 that are multiples of 3 or 5, we
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// get 3, 5, 6 and 9. The sum of these multiples is 23.
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//
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// Find the sum of all the multiples of 3 or 5 below 1000.
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fn compute(n: i32) -> i32 {
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(0..n).filter(|x| x % 3 == 0 || x % 5 == 0).sum()
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}
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fn main() {
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println!("the sum of all multiples of 3 or 5 below 1000 is: {}",
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compute(1000));
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}
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#[test]
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fn test() {
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assert_eq!(23, compute(10));
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assert_eq!(233168, compute(1000));
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}
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