F9

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F9



void main()
{
     unsigned int equ[4];
     unsigned char keypad[]={0,7,8,9,0,
                               4,5,6,0,
                               1,2,3,0,
                               0,0,0,0};
     unsigned char kp,i;
     unsigned char r[4];
     TRISC=0;
     TRISD=0xFF;
     Lcd_Init(&PORTC);
     Keypad_Init(&PORTD);
     Lcd_Cmd(LCD_CURSOR_OFF);
     RETURN:while(Keypad_Read());
     Lcd_Cmd(LCD_CLEAR);
     Lcd_Chr(1,1,'0');
     for(i=0;i<2;i++)
     {
             while(!Keypad_Read());
             if(Keypad_Read()==16)
             {
                     equ[1]=10;
                     goto STEP2;
             }
             if(Keypad_Read()==8)
             {
                     equ[1]=11;
                     goto STEP2;
             }
             kp=Keypad_Read();
             Lcd_Chr(1,i+1,keypad[kp]+48);
             equ[0]=equ[0]*10*i+keypad[kp];
             while(Keypad_Read());
     }
     while(Keypad_Read()!=8&&Keypad_Read()!=16);
     if(Keypad_Read()==16)equ[1]=10;
     if(Keypad_Read()==8)equ[1]=11;
     STEP2:while(Keypad_Read());
     Lcd_Cmd(LCD_CLEAR);
     Lcd_Chr(1,1,'0');
     for(i=0;i<2;i++)
     {
             while(!Keypad_Read());
             if(Keypad_Read()==15)goto STEP3;
             kp=Keypad_Read();
             Lcd_Chr(1,i+1,keypad[kp]+48);
             equ[2]=equ[2]*10*i+keypad[kp];
             while(Keypad_Read());
     }
     while(Keypad_Read()!=15);
     STEP3:if(equ[1]==10)equ[3]=equ[0]+equ[2];
     if(equ[1]==11)equ[3]=equ[0]*equ[2];
     r[3]=equ[3]/1000;
     r[2]=(equ[3]%1000)/100;
     r[1]=(equ[3]%100)/10;
     r[0]=equ[3]%10;
     Lcd_Cmd(LCD_CLEAR);
     Lcd_Chr(1,1,'=');
     for(i=0;i<4;i++)
     {
             Lcd_Chr(1,i+2,r[3-i]+48);
     }
     while(Keypad_Read()!=13);
     goto RETURN;
}

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