简易计算器_lcd1602计算器_基于AT89C51的简易计算器_用LCD写计算器_

#include "common.h" #include "LCD1602DRV.H" #include "matrixkeypaddrv.h" sbit clear=P3^2; sbit BK=P3^3; uchar buf[17]={0}; uchar bufIdx=0; void main() { uchar scancode,keyValue; uchar x,sign; float a=0,b=0,c; uchar isPointStatus=0; uchar Point=0; uchar flag=0; Lcd1602Init(); SetRowCol(0,0); printf(" Welcome "); SetRowCol(1,0); printf("calculate:"); while(1) { if(clear==0) { ClearLine(0); ClearLine(1); flag=0; bufIdx=0; Point=0; isPointStatus=0; } if(BK==0) { printf("\b",GetKeyValue(scancode)); flag=1; bufIdx=0; Point=0; isPointStatus=0; } scancode=GetScanCode(); if(scancode!=0) { keyValue=GetKeyValue(scancode); if(x==0||x==2) { ClearLine(0); ClearLine(1); } if(keyValue>='0'&&keyValue<='9')//显示0-9的数值 { buf[bufIdx++]=keyValue; printf("%c",(char)keyValue); Point=1; x=1; } else if((keyValue=='.')&&(isPointStatus==0)&&(Point!=0))//显示. { buf[bufIdx++]=keyValue; printf("%c",(char)keyValue); isPointStatus=1; } else if(((keyValue=='+')||(keyValue=='-')||(keyValue=='*')||(keyValue=='/'))&&(flag==0))//显示+-*/键值 { sign=keyValue; buf[bufIdx]=0; sscanf(buf,"%f",&a); ClearLine(0); if(isPointStatus==1) { printf("%f",a); } else { printf("%.0f",a); } SetRowCol(0,6); printf("%c",sign); flag=1; bufIdx=0; Point=0; isPointStatus=0; ClearLine(1); } else if(keyValue=='=')//显示等号 { buf[bufIdx]=0; sscanf(buf,"%f",&b); if(sign=='/'&&b==0) { ClearLine(0); printf("input error"); ClearLine(1); flag=0; bufIdx=0; Point=0; isPointStatus=0; } else//算数运算部分 { switch(sign) { case '+':c=a+b;break; case '-':c=a-b;break; case '*':c=a*b;break; case '/':c=a/b;break; default :break; } if(isPointStatus==1) { ClearLine(0); printf("%f%c%f",a,sign,b); ClearLine(1); printf("=%f",c); } else { ClearLine(0); printf("%.0f%c%.0f",a,sign,b); ClearLine(1); if(sign=='/') printf("=%f",c); else printf("=%.0f",c); } bufIdx=0; isPointStatus=0; flag=0; x=2; } } } } }