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Jerubedo, Computer Software Engineer

Category: Programming

Satisfied Customers: 146

Experience: I specialize in Java, Java EE, PHP, mySQL, HTML5, Javascript, LifeRay Portal, CSS, eclipse, netbeans, and SVN.

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I am planning to go to a coding boot camp and am doing some

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I am planning to go to a coding boot camp and am doing some pre course work on ruby coding and need help with some tasks. Can you give me some 1 to 1 suppot

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Hello there. I can certainly help you with this. Here is the full code with comments to help you understand what is happening and when:def eratosthenes(n)# ***** odd x, if x is prime, nums[x >> 1] is true.# ***** false for all multiples of 3.nums = [true, false, true] * ((n + 5) / 6)nums[0] = false # ***** is not prime.nums[1] = true # ***** is prime.# ***** loop and both inner loops are skipping multiples of 2 and 3.# ***** loop checks x * x > n, same as x > Math.sqrt(n).x = 5until (m = x * x) > nif nums[x >> 1]x_times_2 = x << 1x_times_4 = x << 2while m <= nnums[m >> x] = falsem += x_times_2nums[m >> 1] = falsem += x_times_4 # ***** x = 5, skip 45, 75, 105, ...endendx += 2if nums[x >> 1]m = x * xx_times_2 = x << 1x_times_4 = x << 2while m <= nnums[m >> 1] = falsem += x_times_4 # ***** x = 7, skip 63, 105, 147, ...nums[m >> 1] = falsem += x_times_2endendx += 4endprimes = [2]nums.each_index {|x| primes << (x * 2 + 1) if nums[x]}primes.pop while primes.last > nprimesendp eratosthenes(100)

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