51单片机简易计算器 (可算小数)

51单片机简易计算器#includereg51.h#includemath.h#defineucharunsignedchar#defineuintunsignedintsbitbeep=P2^3;sbitdula=P2^6;sbitwela=P2^7;sbitrw=P1^1;sbitrs=P1^0;sbitlcden=P2^5;voidyunsuan();voidkeyinput(chars);voidwrite_data(charddata);voidwrite_com(charcommand);voiddisplay(longa);voidinit();voiddealerror();voiddataoverflow();voidwelcome();charcodetable1[]={0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77};charcodetable2[]=789/456*123-.0=+;charj,k,temp,temp1,temp2,key,mchar,m,flag2=0,flag3=0;longx,y,num;intoperators,input,iny;charerror[5]=error;charoverflow[8]=overflow;charwelcome_[16]=welcometouse!;voiddelay(uintx)//延时{uinta,b;for(a=x;a0;a--)for(b=10;b0;b--);}voiddelay_ms(uintx)//延时{uinta,b;for(a=x;a0;a--)for(b=110;b0;b--);}voidwrite_com(ucharcom)//写命令{P0=com;rs=0;lcden=0;delay(10);lcden=1;delay(10);lcden=0;}voidwrite_data(uchardate)//写数据{P0=date;rs=1;lcden=0;delay(10);lcden=1;delay(10);lcden=0;}longming(intx){longm;switch(x){case9:m=1000000000;returnm;break;case8:m=100000000;returnm;break;case7:m=10000000;returnm;break;case6:m=1000000;returnm;break;case5:m=100000;returnm;break;case4:m=10000;returnm;break;case3:m=1000;returnm;break;case2:m=100;returnm;break;case1:m=10;returnm;break;case0:m=1;returnm;break;}}voiddisplay(longa){longd;inti,flag1=0,temp,c=-1;init();if(a0){a=a*c;write_data('-');}for(i=9;i=0;i--){d=ming(i);temp=a/d;a=a%d;if((temp==0)&&(flag1==0));else{write_data(0x30+temp);flag1=1;}if(i==2){write_data('.');flag1=1;}}}voidinit()//LCD初始化{rw=0;dula=0;wela=0;write_com(0x38);//显示模式设置：16×2显示，5×7点阵，8位数据接口delay(20);write_com(0x0e);//显示模式设置delay(20);write_com(0x06);//显示模式设置：光标右移，字符不移delay(20);write_com(0x01);//清屏幕指令，将以前的显示内容清除delay(20);}voidyunsuan()//运算{if(iny){switch(operators){case1:x=x+y;num=x;if(num10000000000&&num-10000000000){display(num);}elsedataoverflow();break;case2:x=x-y;num=x;if(num10000000000&&num-10000000000){display(num);}elsedataoverflow();break;case3:x=x*y;num=x/100;if(num10000000000&&num-10000000000){display(num);}elsedataoverflow();break;case4:if(y==0)dealerror();else{if(y100){x=x*100;y=y*100;}y=y/100;x=x/y;num=x;if(num10000000000&&num-10000000000){display(num);}elsedataoverflow();}break;}y=0;}}voiddealerror()//除数为0{inti=0;write_com(0x01);for(i=0;i5;i++)write_data(error[i]);}voiddataoverflow()//数值溢出{inti=0;write_com(0x01);for(i=0;i8;i++)write_data(overflow[i]);}voidwelcome()//欢迎界面{inti=0;write_com(0x01);for(i=0;i16;i++)write_data(welcome_[i]);}voidkeyinput(chars)//键盘输入{if(s='9'&&s='0')//判断按下的键是否为数值{if(flag3==0)num=num*10+100*(s-'0');elsenum=num*10+10*(s-'0');if(flag2==1){num=num/10;flag3=1;}if(operators0){y=num;iny=1;}elsex=num;if(num10000000000&&num-10000000000)//当前数值是否超出限定范围display(num);elsedataoverflow();}elseswitch(s){case'.':/*iny=0;operators=0;*/flag2=1;break;case'=':write_data(table2[14]);delay(10);yunsuan();iny=0;operators=0;num=0;flag2=0;flag3=0;break;case'+':if(operators)yunsuan();operators=1;write_data(table2[15]);num=0;flag2=0;flag3=0;break;case'-':if(operators)yunsuan();operators=2;write_data(table2[11]);num=0;flag2=0;flag3=0;break;case'*':if(operators)yunsuan();operators=3;write_data(table2[7]);num=0;flag2=0;flag3=0;break;case'/':if(operators)yunsuan();operators=4;write_data(table2[3]);num=0;flag2=0;flag3=0;break;}}voidmain()//主函数{chari;charflag0=1;init();welcome();for(i=0;i10;i++)delay_ms(100);init();while(1){P3=0xf0;temp1=P3;P3=0x0f;temp2=P3;temp=temp1|temp2;while(P3!=0x0f){beep=0;}beep=1;for(i=0;i16;i++){if(temp==table1[i]){m=table2[i];flag0=0;}}if(flag0==0){keyinput(m);flag0=1;}}}