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53 lines
1.0 KiB
53 lines
1.0 KiB
5 years ago
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OPCODES = ARGF.read.split(?,).map(&:to_i)
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def run(memory)
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pc = 0
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loop do
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instruction = memory[pc]
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return if instruction == 99
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p pc
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a, b, c, opcode = instruction.to_s.rjust(5, ?0).scan(/^(0|1)(0|1)(0|1)(\d\d)$/)[0].map(&:to_i)
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c = c.zero? ? memory[memory[pc+1]] : memory[pc+1]
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b = b.zero? ? memory[memory[pc+2]] : memory[pc+2]
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a = a.zero? ? memory[memory[pc+3]] : memory[pc+3]
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case opcode
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when 1
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memory[memory[pc+3]] = c + b
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pc += 4
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when 2
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memory[memory[pc+3]] = c * b
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pc += 4
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when 3
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memory[memory[pc+1]] = 5
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pc += 2
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when 4
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puts c
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pc += 2
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when 5
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if c.nonzero?
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pc = b
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else
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pc += 3
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end
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when 6
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if c.zero?
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pc = b
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else
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pc += 3
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end
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when 7
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memory[memory[pc+3]] = (c < b) ? 1 : 0
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pc += 4
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when 8
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memory[memory[pc+3]] = (c == b) ? 1 : 0
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pc += 4
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else
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fail "unrecognized instruction: #{instruction}"
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end
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end
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end
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run(OPCODES)
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