汇编实验11.docx

暨南大学本科实验报告专用纸课程名称汇编语言程序设计成绩评定实验项目名称算数运算程序设计指导教师实验目的和要求1、掌握算术运算程序的设计方法。2、进一步掌握各种程序结构。实验内容1、将两个多字节压缩BCD码相加，假定这两个压缩BCD码分别从BCD1、BCD2开始存放，结果从BCD3开始存放。2、编写子程序实现两个多字节二进制数相乘，并用子程序实现以十六进制的形式输出乘积。二、程序流程图（每题分开写）三、源程序（每题分开写）DSEG SEGMENT DATABCD1 db 13h,14hBCD2 db 15h,16hBCD3 db 2dup(0)DSEG ENDSSSEG SEGMENT STACK STACKdb 256 DUP(0)SSEG ENDSCSEG SEGMENT CODE START PROC FAR ; set segment registers: MOV AX, DSEG MOV DS, AX MOV ES, AXmovsi,offset BCD1movdi,offset BCD2movbx,offset BCD3mov cx,3clcadd1:moval,byteptr [si]adc al,[di]daamov byte ptr [bx],alincsiinc diincbxloop add1 MOV AX, 4C00h ; exit to operating system. INT 21h START ENDPCSEG ENDSEND START ; set entry point.//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------DSEG SEGMENT DATA ; add your data here!num1db 12h,34hnum2db 56h,78hcntdw 2num3db 4 dup(0)stringdb 20 dup($)DSEG ENDSSSEG SEGMENT STACK STACKdb 256 DUP(0)SSEG ENDSCSEG SEGMENT CODE START PROC FAR ; set segment registers: MOV AX, DSEG MOV DS, AX MOV ES, AX ; add your code herelea si,num1lea di,num2lea bx,num3call mul123call out16 MOV AX, 4C00h ; exit to operating system. INT 21h START ENDPmul123procpush axpush cxpush dxpushbppushbxpush dimovbp,spmovcx,cntaddsi,cxsub si,1mov dx,0 loop1:cmp cx,0je out1mov di,[bp]adddi,cntsub di,1movbx,[bp+2]addbx,cntaddbx,cxsub bx,2push cxmovcx,cnt loop2:cmp cx,0je out2mov al,[si]mov ah,[di]mul ahaddax,dxjc c1mov dx,0jmp co1 c1:mov dx,1 co1:add al,[bx+1]adc ah,[bx]jnc c2mov dx,1 c2:mov [bx],ahmov [bx+1],alsub di,1sub cx,1sub bx,1jmp loop2 out2:pop cxsub cx,1sub si,1jmp loop1 out1:pop dipopbxpopbppop dxpop cxpop axretmul123endpout16procpush ax