# Js floating point number to calculate exactly of plus minus multiply divide

• 2020-03-30 01:03:41
• OfStack

``````
<SPAN style="FONT-SIZE: 18px">//Note: javascript addition results will have errors, in the two floating point Numbers will be more obvious when adding. This function returns a more accurate addition result.
//Return value: the exact result of arg1 plus arg2 & NBSP;
var r1,r2,m;
try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}
try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}
m=Math.pow(10,Math.max(r1,r2))
return (arg1*m+arg2*m)/m
}</SPAN>
``````

``````
<SPAN style="FONT-SIZE: 18px">

//Note: javascript subtraction results will have errors, in the two floating point Numbers will be more obvious when adding. This function returns a more accurate subtraction result.
//Call: accSub (arg1, arg2)
//Return value: the exact result of arg1 minus arg2;
function accSub(arg1,arg2){
}</SPAN>
``````

``````
<SPAN style="FONT-SIZE: 18px">

//Note: javascript multiplication results will have errors, in the two floating point number multiplication will be more obvious. This function returns a more precise multiplication result.
//Call: accMul (arg1, arg2)
//Return value: the exact result of arg1 times arg2 & NBSP;
function accMul(arg1,arg2)
{
var m=0,s1=arg1.toString(),s2=arg2.toString();
try{m+=s1.split(".")[1].length}catch(e){}
try{m+=s2.split(".")[1].length}catch(e){}
return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m)
}</SPAN>
``````

``````
<SPAN style="FONT-SIZE: 18px">

//Note: javascript division results will have errors, in two floating point division will be more obvious. This function returns a more precise division result.
//Call: accDiv (arg1, arg2)
//Return value: the exact result of arg1 divided by arg2 & NBSP;
function accDiv(arg1,arg2){
var t1=0,t2=0,r1,r2;
try{t1=arg1.toString().split(".")[1].length}catch(e){}
try{t2=arg2.toString().split(".")[1].length}catch(e){}
with(Math){
r1=Number(arg1.toString().replace(".",""))
r2=Number(arg2.toString().replace(".",""))
return (r1/r2)*pow(10,t2-t1);
}
}</SPAN>
``````

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