20201220蔡笃俊Pep9课下作业

1.伪代码算法如下
Set sum to 0
Read num1
Set sum to sum + num1
Read num2
Set sum to sum + num2
Read num3
Set sum to sum + num3
Write sum
2.通过学习教材118页，学习到汇编语言如下
BR main
sum: .WORD 0x0000
num1: .BLOCK 2
num2: .BLOCK 2
num3: .BLOCK 2

main: LDWA sum,d
DECI num1,d
ADDA num1,d
DECI num2,d
ADDA num2,d
DECI num3,d
ADDA num3,d
STWA sum,d
DECO sum,d
STOP
.END

实现算法。从中得到机器指令如下

12 00 0B 00 00 00 00 00 00 00 00 C1 00 03 31 00

05 61 00 05 31 00 07 61 00 07 31 00 09 61 00 09

E1 00 03 39 00 03 00 zz

完成。