#include <iVIEW.H>
#include <mmi100.H>

int main()
{

   int quit=0;
   int n; 
   int x=0;
   int y=1;
   int i=0; 
   int j=0;
   long int chr, temp, total, k, m;
   char c='+';
   char data[10];
   
   InitLib();
   InitLCD();

   LcdSetCursorOn(); /* Display cursor */
//  *LcdShowKey = 1;
   total=0;
/* quit program crotrol */
   while(!quit)  
   {
      x=x+1;   k=1;
      SetCursorAt(x, y);  /* move cursor to (x,y) */
      chr=Getch();
      
 /*iview screen wild and high control */     
      if(x==17) { x=1;  y=y+1;  }
      if (y==8)  {ClrScrn(); x=1; y=1;}      
      if (y==0) y=1;   
      
/* backspace [B.S.] control */
       if (chr==8 || chr==207 ) {  
              if(j >0) data[j-1] =0;
              x=x-1; 
              TextOutAt(x, y, " ");  
              Print("\b", " ");
              x=x-1;  
              if(j >0) j=j-1;
              }
         else {
             TextOutAt(x, y, (char *)&chr);    
             Print("%c", chr);
        }
/* Quit program control use Q, ESC*/    	
      if (chr=='q'||chr==27||chr==206) { x=1; y=1; quit=1;}
//           else if(chr<0x80) Print("%c",chr);
 //               Print("(48) [%d]",chr);
/*number too large warnning  */               
      if (j>=10)
              {
      	x=1; y=y+1;
//      	TextOutAt_len(x, y, "too large!", 10); 
                j=0;
              }

/* calculate control */
   if ((chr<58 && chr>46) || chr==45 ||chr==42||chr==43||chr==13||chr==205)
    {
    /*get number */  
      data[j]=(char)chr; 

      /* calculate  +, -, *, /  */        
      if (chr=='+' || chr=='-' || chr=='*' || chr=='/' || chr==13 || chr==205)
         { 
      	  data[j]='0'; temp=0;
     	  n=j;  n=n-1;
      	  for (n; n>=0; n--)
      	     {
      	      temp=temp+(data[n]-48)*k;
                      k=10*k;
                     } //for loop
//       	      Print ("%d temp=%d\r\n", k,temp);  
//                  n=j;
//                 Print ("(78) c= %c\r\n", c);  
          
                 switch(c) {
                     case '+' : total=total+temp; c=(char)chr; j=0; break;
                     case '-' : total=total-temp; c=(char)chr;  j=0;break;
                     case '*' : total=total*temp; c=(char)chr; j=0; break;
                     case '/' : total=total/temp; c=(char)chr;  j=0;break;
                     } //end swich
           } else  j=j+1;   // if : calculate +,-,*,/      
       /* enter to show answer  */               
       if (chr==13 || chr==205)
        {
      	       x=1; y=y+1;
      	       switch(c) {                         
                           case '+' : total=total+temp; c=(char)chr; break;
                           case '-' : total=total-temp; c=(char)chr; break;
                           case '*' : total=total*temp; c=(char)chr; break;
                           case '/' : total=total/temp; c=(char)chr; break;
                         } //end swich
      	       TextOutAt(x, y, "=");
      	       x=x+1;
                     /* count digit */ 
                       n=1; m=total;
                       while (m>=10 || m<=-10) 
        	       {
      	        m=m/10; 
        	        n=n+1;
                       } 
                       if (total<0) n=n+1;
      	       IntOutAt(x, y, n, total );
      	       Print("\r\n =%ld\r\n", total);
       	       x=0; if (y<8) y=y+1;
       	       j=0;total=0; k=1;c='+';
              
         } //end if : show answer
    }//end if : end of calculate control 
    
   
   }//while loop : end of quit program control
   CloseLCD();
   return 0;
} //end main