function onFocusVALUE()
{ BResult.focus();}

var M1="0", M2="0", op=0, count=0, b=0;

function checkNum(str)
{
 for (var i = 0; i < str.length; i++){
   var ch = str.substring(i, i+1);//буферный символ
   if ( ((ch<"0")||(ch >"9")) && ((ch!="/")&&(ch!="*")&&(ch!="+")&&(ch!="-")&&(ch!=".")&&(ch!="(")&&(ch!=")")) ){
       ERROR.value="Некорректное выражение!";
       return false;
   }
 }return true;
}


function onClickButton(n)
{
  ERROR.value="Вводите числа ("+n+")";
  switch(n){
   case "=":
     RESULT.value="0";
     if(op||count) ERROR.value='Завершите выражение';
     else if (checkNum(STRING.value)){
       RESULT.value=eval(STRING.value);  op=0;
       STRING.value="0"; b=op=0;
     }
     break;
   case "0":case "1":case "2":case "3":case "4":case "5":case "6":case "7":case "8":case "9":
     if(STRING.value=="0") STRING.value=n;
     else STRING.value+=n;
     b=op=0;
     break;
   case ",":
     if(b)break; b=1;  
     if(STRING.value=="0") STRING.value="0.";
     else STRING.value+=".";
     op=0;
     break;
   case "+":case "-":case "*":case "/":b=0;
     if((STRING.value!="0")&&(STRING.value.length)&&(!op)){ STRING.value+=n; op=1;}
     break;
   case "<":b=0;
     if(STRING.value.length) STRING.value=STRING.value.substring(0, STRING.value.length-1);
     if(!STRING.value.length) STRING.value="0";
     if(op) op=0;
     break;
   case "?":b=0;
     RESULT.value=-RESULT.value;
     break;
   case "(":b=0;
     if(op||(STRING.value=="0")){
       if(STRING.value=="0") STRING.value=n;
       else STRING.value+=n;
       count++;
     }
     break;
   case ")":b=0;
     if(!op&&(STRING.value!="0")&&(count>0))
       STRING.value+=n, count--;
     break;
 }
}


function ClearAll()
{
 MEM1.value="0"; MEM2.value="0"; RESULT.value="0"; STRING.value="0"; op=0;
}

function ClearResult()
{STRING.value="0"; op=0;}

function ClearM1()
{MEM1.value="0";}

function ClearM2()
{MEM2.value="0";}

function ReadM1()
{if((MEM1.value!="0")&&(MEM1.value.length)) op=0, STRING.value+=MEM1.value;}

function ReadM2()
{if((MEM2.value!="0")&&(MEM2.value.length)) op=0, STRING.value+=MEM2.value;}

function AddM1()
{ onClickButton("=");  MEM1.value=eval(MEM1.value+"+"+RESULT.value);}

function AddM2()
{ onClickButton("=");  MEM2.value=eval(MEM2.value+"+"+RESULT.value);}

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