简易计算器

• 连接图
• 仿真电路图
• 
• 加法运算

• #include<reg51.h>
  sbit col0=P1^0;
  sbit col1=P1^1;
  sbit col2=P1^2;
  sbit col3=P1^3;
  sbit row0=P1^4;
  sbit row1=P1^5;
  sbit row2=P1^6;
  sbit row3=P1^7;
  int m,n;
  int seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
  void key1();
  void key2();
  void display1();
  void display2();
  void delay(int i)
  {
  int k,j;
  for(k=0;k<i;k++)
  for(j=0;j<100;j++);
  }
  void key1()    //检测是否有按键按下
  {
  while(1){
  P1=0x0f;
  if(P1!=0x0f)
  delay(10);
  if(P1!=0x0f)
  break;
  }
  }
  void key2()     //检测哪个按键按下
  {
  P1=0xff;
  col0=0;
  if(row0==0) n=1;
  if(row1==0) n=2;
  if(row2==0) n=3;
  if(row3==0) n=4;
  P1=0xff;
  col1=0;
  if(row0==0) n=5;
  if(row1==0) n=6;
  if(row2==0) n=7;
  if(row3==0) n=8;
  P1=0xff;
  col2=0;
  if(row0==0) n=9;
  if(row1==0) n=0;
  if(row2==0) m=n;
  if(row3==0) display2();
  
  }
  void display1()
  {
  P2=0xfe;
  P0=seg[n];
  }
  void display2(){
  while(1)
  {
  P2=0xfd;
  if((m+n)<10)
  P0=0xff;
  else
  P0=seg[(m+n)/10];
  delay(10);
  
  P2=0xfe;
  P0=seg[(m+n)%10];
  delay(10);
  }
  }
  void main()
  {
  while(1)
  {
  key1();
  key2();
  display1();
  }
  }

• 四则运算

• #include<reg51.h>
  #include<math.h>
  sbit col0=P1^0;
  sbit col1=P1^1;
  sbit col2=P1^2;
  sbit col3=P1^3;
  sbit row0=P1^4;
  sbit row1=P1^5;
  sbit row2=P1^6;
  sbit row3=P1^7;
  int m,n,q;
  dis[2];
  int seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0xbf};//0--9;
  void key1();
  void key2();
  void display1();
  void display2();
  void delay(int i)
  {
      int k,j;
      for(k=0;k<i;k++)
          for(j=0;j<100;j++);
  }
  void key1()    //检测是否有按键按下
  {
      while(1){
          P1=0x0f;
          if(P1!=0x0f)
              delay(10);
              if(P1!=0x0f)
                  break;
          }
  }
  void key2()     //检测哪个按键按下
  {
      P1=0xff;col0=0;
      if(row0==0) n=1;
      if(row1==0) n=2;
      if(row2==0) n=3;
      if(row3==0) n=4;
      P1=0xff;col1=0;
      if(row0==0) n=5;
      if(row1==0) n=6;
      if(row2==0) n=7;
      if(row3==0) n=8;
      P1=0xff;col2=0;
      if(row0==0) n=9;
      if(row1==0) n=0;
  
      if(row2==0) {m=n;q=1;}//+
      if(row3==0) {m=n;q=2;} //-
      P1=0XFF;col3=0;
      if(row0==0) {m=n;q=3;} //*
      if(row1==0) {m=n;q=4;} // /
      if(row2==0) 
      {
          switch(q)
          {
              case 1:    if((m+n)>=10) dis[0]=(m+n)/10;else dis[0]=10 ;dis[1]=(m+n)%10;break;//加：求和并拆字求显示值给dis[0]和dis[1]
              case 2:    if(m>n){dis[0]=10;dis[1]=m-n;}else {dis[0]=11;dis[1]=n-m;} break;//减：求差并拆字求显示值给dis[0]和dis[1]
              case 3:    if((m*n)>=10) dis[0]=(m*n)/10;else dis[0]=10;dis[1]=(m*n)%10;break;//
              case 4:    dis[0]=m/n;dis[1]=m%n*10/n;break;
          }
          display2();
      }
  }
  void display1()
  {
      P2=0xfe;
      P0=seg[n];
  }
  void display2()
  {
  while(1)
  {
  P2=0xfd; //11111101
  if(q==4)
      P0=seg[dis[0]]&0x7f; //加小数点
  else
      P0=seg[dis[0]];
  delay(1);
  P2=0xfe;  //11111110
  P0=seg[dis[1]];
  delay(1);
  
  }
      
  }
  void main()
  {
  while(1)
  {
  key1();
  key2();
  display1();
  }
  }