diff --git a/config.json b/config.json index 424b66c3ab017..09d5e853f3606 100644 --- a/config.json +++ b/config.json @@ -96,6 +96,17 @@ "control-flow (if-else statements)" ] }, + { + "slug": "sieve", + "difficulty": 2, + "topics": [ + "control-flow (loops)", + "control-flow (conditionals)", + "mathematics", + "arrays", + "filtering" + ] + }, { "slug": "trinary", "difficulty": 2, diff --git a/exercises/sieve/example.jl b/exercises/sieve/example.jl new file mode 100644 index 0000000000000..96f31c21593a1 --- /dev/null +++ b/exercises/sieve/example.jl @@ -0,0 +1,15 @@ +function sieve(limit::Integer) + limit <= 0 && error("Invalid limit") + nums = fill(true, limit) + nums[1] = false + primes = [] + while (i = findfirst(nums)) > 0 + push!(primes, i) + for j = find(nums) + if j % i == 0 + nums[j] = false + end + end + end + primes +end diff --git a/exercises/sieve/runtests.jl b/exercises/sieve/runtests.jl new file mode 100644 index 0000000000000..d653751cc141d --- /dev/null +++ b/exercises/sieve/runtests.jl @@ -0,0 +1,37 @@ +using Base.Test + +include("sieve.jl") + +@testset "no primes under two" begin + @test sieve(1) == [] +end + +@testset "find first prime" begin + @test sieve(2) == [2] +end + +@testset "find primes up to 10" begin + @test sieve(10) == [2, 3, 5, 7] +end + +@testset "limit is prime" begin + @test sieve(13) == [2, 3, 5, 7, 11, 13] +end + +@testset "find primes up to 1000" begin + @test sieve(1000) == [ + 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, + 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, + 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, + 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, + 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, + 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, + 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, + 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, + 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, + 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, + 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, + 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, + 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997 + ] +end diff --git a/exercises/sieve/sieve.jl b/exercises/sieve/sieve.jl new file mode 100644 index 0000000000000..e32cc36b742d2 --- /dev/null +++ b/exercises/sieve/sieve.jl @@ -0,0 +1,3 @@ +function sieve(limit::Integer) + +end