pep9课下作业

pep

编写一个伪代码算法，读入三个值，输出它们的和

Set counter to 0
Set sum to 0
Read limit
While(counter<limit)
Read num
Set sum to sum + num
Set counter to counter + 1
print sum

用PEP/9 机器指令实现算法

12 00 0B 00 00 00 00 00 00 00 00 31 00 09 31 00
07 C1 00 03 61 00 07 E1 00 03 C1 00 05 60 00 01
E1 00 05 A1 00 09 18 00 2C 12 00 0E 39 00 03 00
zz

用PEP/9 汇编语言实现算法

sum1: .WORD 0x0000
counter: .WORD 0x0000
num: .BLOCK 2
limit: .BLOCK 2
main: DECI limit,d
loop: DECI num,d
LDWA sum,d
ADDA num,d
STWA sum,d
LDWA counter,d
ADDA l,d
STWA counter,d
CPWA limit,d
BREQ finish
BR loop
finish: DECO sum,d
STOP
.END