Pep9课下作业

伪代码

Set sum to 0
Read num 1
set sum to sum+num1
read num2
set sum to sum+num2
read num3
set sum to sum+num3
write sum

Pep9机器指令

   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

Pep9汇编语言

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