微机课程设计报告(14)

;-------------------------------------------------------------------------------------- ;运算符号键部分 addkey: pop ax mov fssf,0 cmp yunf,0 jz placef

call calp

jmp placef

subkey:pop ax mov fssf,0 cmp yunf,0 jz placef

call calp

jmp placef

mulkey: pop ax mov fssf,0 cmp yunf,0 jz placef

call calp

jmp placef

divkey: pop ax mov fssf,0 cmp yunf,0 jz placef

;若之前没有过运算符，则置运算符

;若之前有过运算符，则调用CALP进行运算 ;运算结束后置当前运算符