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import binandint
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def alu(a,b,alu_ctrl): #a,b为两个运算数，alu_ctrl为控制信号，返回运算结果result与是否为0 zero
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if alu_ctrl=='00000':
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pass
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elif alu_ctrl=='00001':
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pass
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elif alu_ctrl=='00010':
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pass
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elif alu_ctrl=='00011':
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pass
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elif alu_ctrl=='00100':
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pass
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elif alu_ctrl=='00101':
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pass
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elif alu_ctrl=='00110':
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pass
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elif alu_ctrl=='00111':
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pass
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elif alu_ctrl=='01000':
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pass
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elif alu_ctrl=='01001':
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pass
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elif alu_ctrl=='01010':
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pass
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elif alu_ctrl=='01011':
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pass
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elif alu_ctrl=='01100':
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pass
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elif alu_ctrl=='01101':
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pass
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elif alu_ctrl=='01110':
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pass
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elif alu_ctrl=='01111':
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pass
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else:
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pass
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