一些简单的汇编程序.doc

1.编制程序计算S=1+2+3+4+……+N直到和大于500为止，并将结果在屏幕上显示出来（N的值和最终的和的值）。 DATA SEGMENT N DW ? SUM DW ? DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX MOV AX,0 MOV BL,0 E1: INC BL ADD AX,BX CMP AX,500 JBE E1 MOV [N],BX MOV [SUM],AX E2: MOV AX,BX MOV BL,10 DIV BL ADD AL,30H MOV DL,AL MOV CL,AH MOV AH,2 INT 21H ADD CL,30H MOV DL,CL MOV AH,2 INT 21H MOV AH,2 MOV DL,0AH INT 21H MOV AX,SUM CWD MOV BX,100 DIV BX MOV CX,DX ADD AL,30H MOV DL,AL MOV AH,2 INT 21H MOV BL,10 MOV AX,CX DIV BL MOV CL,AH MOV AH,2 ADD AL,30H MOV DL,AL INT 21H MOV AH,2 ADD CL,30H MOV DL,CL INT 21H MOV AH,4CH INT 21H CODE ENDS END START 2.从键盘输入学生成绩（A、B、C、D），自动汇总并显示各类分数的人数。按下$键则停止输入；若按下A、B、C、D之外的键则提示“INPUT ERROR”信息。 DATA SEGMENT M1 DB Please input A,B,C,D:,13,10,$ M2 DB 13,10,Input error! ,13,10,$ M3 DB 13,10,The number of A is: $ M4 DB 13,10,The number of B is: $ M5 DB 13,10,The number of C is: $ M6 DB 13,10,The number of D is: $ DATA ENDS STACK SEGMENT STACK ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA,SS:STACK START: MOV AX,DATA MOV DS,AX MOV AH,9 MOV DX,OFFSET M1 INT 21H MOV BX,0 MOV CX,0 E1: MOV AH,1 INT 21H MOV AH,41H CMP AL,AH JNZ E2 INC BL JMP E1 E2: MOV AH,42H CMP AH,AL JNZ E3 INC BH JMP E1 E3: MOV AH,43H CMP AH,AL JNZ E4 INC CL JMP E1 E4: MOV AH,44H CMP AH,AL JNZ E5 INC CH JMP E1 E5: MOV AH,24H CMP AH,AL JZ E6 MOV AH,9 MOV DX,OFFSET M2 INT 21H JMP E1 E6: MOV AH,9 MOV DX,OFFSET M3 INT 21H MOV AH,2 ADC BL,30H MOV DL,BL INT 21H MOV AH,9 MOV DX,OFFSET M4 INT 21H MOV AH,2 ADC BH,30H