import binandint


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
    if alu_ctrl == '00000':
        pass
    elif alu_ctrl == '00001':
        pass
    elif alu_ctrl == '00010':
        pass
    elif alu_ctrl == '00011':
        pass
    elif alu_ctrl == '00100':
        pass
    elif alu_ctrl == '00101':
        pass
    elif alu_ctrl == '00110':
        pass
    elif alu_ctrl == '00111':
        pass
    elif alu_ctrl == '01000':
        pass
    elif alu_ctrl == '01001':
        pass
    elif alu_ctrl == '01010':
        pass
    elif alu_ctrl == '01011':
        pass
    elif alu_ctrl == '01100':
        pass
    elif alu_ctrl == '01101':
        pass
    elif alu_ctrl == '01110':
        pass
    elif alu_ctrl == '01111':
        pass
    else:
        pass