在Java中模拟有符号位乘法

Question

我试图创建一个java模拟器，它将模拟4位数字的所有可能的有符号乘法。

我的代码布局使用字符来表示实际位。

我现在的问题是逐位拆分我的int输入（被乘数/乘数），将每个位放入一个新的char中，这样我就可以操作每个char（即位）来执行有符号乘法。

非常感谢任何指针

public class SignedMultiplication {

int multiplicand, multiplier, expected_product, actual_product;
char md_bit0, md_bit1, md_bit2, md_bit3, mr_bit0, mr_bit1, mr_bit2, mr_bit3;
char pr_bit0, pr_bit1, pr_bit2, pr_bit3, pr_bit4, pr_bit5, pr_bit6, pr_bit7;

for(multiplicand=-8;multiplicand<8;++multiplicand){

// set multiplicand bits for two's complement 
md_bit0 = ;
md_bit1 = ;
md_bit2 = ;
md_bit3 = ;

    for(multiplier = -8; multiplier < 8; ++multiplier){

    // set multiplier bits for two's complement 
    mr_bit0 = ;
    mr_bit1 = ;
    mr_bit2 = ;
    mr_bit3 = ;

    // perform 4 bit multiplier operation
    // result is in pr_bit0 through pr_bit7

    // set actual product to value converting 2's complement to an integer
    actual_product = ;

    expected_product = multiplicand * multiplier;

        if( expected_product != actual_product ){
            System.out.println("Multiplicand: " + multiplicand + " Multiplier: " + multiplier + 
                    " Expected Result: " + expected_product + " Obtained: " + actual_product );
        }
    }
}

}