Num7 NPM | npm.io

num7 - SUPREME PRECISION GENERAL PURPOSE ARITHMETIC-LOGIC DECIMAL LIBRARY PACKAGE FOR JAVASCRIPT LANGUAGE

DESCRIPTION AND DOC

Num is a lightweight floating point numeric class for arbitrary precision results with always supreme precision.

Easy to use like school math and WITHOUT IEEE754 ISSUES or -0 FAILURES, it can be deployed
for web e-commerce developing, accounting apps and general math programs included financial ones.
Fairly portable to Python one (and vice-versa) also a Node.js system can work with almost num7 capability.

Installation num7 package

Using npm

To install num7 package using npm, enter the following:

npm install num7   //Win
npm install num7  //Mac
npm install num7 //Linux

HOW TO USE (integer numeric strings (ex. '2.0') MUST BE SUFFIXED WITH .0):

--- CALCULATOR MODE ---

                   > num7 = require('num7'); Num = num7.Num; calc = num7.Num; //IMPORT num7 LIBRARY
ADDITION:          > calc.add('-5.3', '2.1').toString()    //new Num('-3.2')  
SUBTRACTION:       > calc.sub('-5.3', '2.1').toString()    //new Num('-7.4')  
MULTIPLICATION:    > calc.mul('-5.3', '2.1').toString()    //new Num('-11.13')  
DIVISION:          > calc.div('-5.3', '2.1').toString()    //new Num('-2.52380952380952380952380952380952380952380952380952380952380952380952380952380952')  
M+:                > M = new calc('0.0'); M.Inc('3.0'); M.Inc('3.3'); M.Inc('3.7'); console.log(M.toString()) //10.0  
M-:                >                  M.Dec('5.0'); M.Dec('3.3'); M.Dec('1.5'); console.log(M.toString()) //0.2  
MC:                > M.Clear(); console.log(M.toString())  //0.0  
INT   DIV AND REM: > calc.divmod('5.0', '3.0').toString()  //'1.0,2.0' => Array()  
FLOAT DIV AND REM: > calc.divmod('5.2', '3.1').toString()  //'1.0,2.1' => Array()  
POWER:             > calc.pow('-5.3', '2.0').toString()    //new Num('28.09')  
SQRT:              > calc.sqrt('2.0').toString()           //new Num('1.41421356237309504880168872420969807856967187537694807317667973799073247846210703')  
ROOT_ith           > calc.root_i('1.860867', 3).toString() //new Num('1.23')  
ROUND:             > calc.sqrt('2.0').Round(2).toString()  //new Num('1.41')  
ABSOLUTE VALUE     > calc.abs('-3.0').toString()           //new Num('3.0')  
SUM:               > cart = ['19.32','18.37','15.13']; calc.sum(cart).toString()     	   //new Num('52.82')  
MEAN:              > cart = ['19.32','18.37','15.13']; calc.mean(cart).Round().toString() //new Num('17.61')  
MIN:               > cart = ['19.32','18.37','15.13']; calc.min(cart).toString()   //new Num('15.13')  
MAX:               > cart = ['19.32','18.37','15.13']; calc.max(cart).toString()  //new Num('19.32')  
EXP:               > calc.mul('-5.3e1024', '2.1e1024').Num2exp()                 //'-1.113e2049'  
REPL:              > a = new calc('0.1'); b = new calc('0.2'); calc.add(a, b).toString() //0.3

CODING:

> num7 = require('num7'); Num = num7.Num; calc = num7.Num; //IMPORT num7 LIBRARY

(=) assignment:

> a = new Num('3.0'); b = new Num('5.0'); c = new Num('0.0'); //
> console.log('a =', a.toString(), 'b =', b.toString(), 'c =', c.toString()) //a = 3.0 b = 5.0 c = 0.0

(+) adding:

> R = a.Add(b).Add(c); console.log(R.toString()) //8.0  
> a = new Num('0.1'); b = new Num('0.2'); c = new Num('0.0'); console.log(a.Add(b).Add(c).toString()) //0.3

(-) subtracting:

> a = new Num('0.1'); b = new Num('0.2'); c = new Num('0.3');  
> console.log(a.Add(b).Sub(c).toString()) //0.0  
> R = new Num('-3.99').Sub(new Num('-5.20')).Sub(new Num('+3.01')); console.log(R.toString()) //-1.8

(*) multiplying:

> new Num('-3.99').Mul(new Num('-5.20')).Mul(new Num('+3.01')) //-3.99 * (-5.20) * (+3.01 ) = new Num('62.45148')

(/) dividing (80 decimal digits default gets only for division operation):

> new Num('3.0').Div(new Num('5.7')) //3 : 5.7 = new Num('0.52631578947368421052631578947368421052631578947368421052631578947368421052631578')

Division precision (ex. 128 decs) may be specified as parameter after numeric string as:

> new Num('3.0', 128).Div(new Num('5.7', 128), 128) //3 : 5.7 = new Num('0.52631578947368421052631578947368421052631578947368421052631578947368421052631578947368421052631578947368421052631578947368421052')

(// % operators by divmod function) integer division and remainder:

> a = new Num('14.0'); b = new Num('4.0') //  
> QR = Num.divmod(a, b); console.log('Quotient =', QR[0].toString(), 'Remainder =', QR[1].toString())   //Quotient = 3.0 Remainder = 2.0

(divmod function) floating division and remainder:

> a = new Num('10.123456789'); b = new Num('2.0') // 
> QR = Num.divmod(a, b); console.log('Quotient =', QR[0].toString(), 'Remainder =', QR[1].toString())   //Quotient = 5.0 Remainder = 0.123456789

(sqrt) square root function:

> a = new Num('123_456_789.1234567890123456789'); root = a.Sqrt() // new Num('11111.11106611111096998611053449930232404576951925017079015206589094347963821409843324')  
> console.log('result digits number Array =>', root.Len()) //result digits number Array => (5, 80)

(**) power pow function:

> a = new Num('2.22123').Pow(64); console.log(a.toString()) //# 15204983311631674774944.65147209888660757554174463321311015807893679105748958794491681177995203669698667160837739445605536688871012507194541849848681968140805876570485027380472936734094801420552285940765338219588362327695177798251793912104057999943308320501195784173135380826413054938730768027747418766018606636039075568645106645889100039914241  
> console.log(a.Len().toString())           //(23, 320) digits len Array  
> console.log(new Num(Num.pi).toString())  //3.141592654  
> console.log(Num.pow(new Num(Num.pi), 8).toString()) //Num('9488.531025982131642534428505085353941520356351078169077371202330414440366336')

logic in, not in, is, is not, LT, LE, GT, GE, EQ, NE and relational operators (and, or, not).

(in):

> L = [new Num('0.1'), new Num('1.0'), new Num('5.5'), new Num('-3.0'), new Num('-2.9'), new Num('-3.0001'), new Num('2.2')]   
> Num.in(L, new Num('-3.0001'))   //true

Num.in(L, new Num('-3.00001')) //false new Num('-3.0001').In(L) //true

(not_in):

Num.not_in(L, new Num('-3.0001')) //false Num.not_in(L, new Num('-3.00001')) //true new Num('-3.0001').Not_in(L) //false

(is, is_not):

> M = new calc('0.0'); Num.is(new Num('0.0'), M)    //false

M = new calc('0.0'); Num.is_not(M.Inc('0.1'), M) //false M; N = M; N.Dec('0.1'); Num.is(N, M) //true N.Is(M) //true
N.Is_not(M) //false

LT, LE, GT, GE, EQ, NE (< <= > >= == !=)

> a = new Num('0.0'); b = new Num('0.1'); c = new Num('-0.2')

a.LT(b); a.LT(c); b.LT(c) //true false false a.LE(b); a.LE(c); b.LE(c) //true false false a.GT(b); a.GT(c); b.GT(c) //false true true a.GE(a); a.GE(c); b.GE(c) //true true true c.EQ(new Num('-2.0').Mul(b)); a.EQ(c.Add(b.Mul('2.0'))); a.NE(a.Add(b).Add(c)) //true true true a.And(b); a.Or(b); a.Not() //false true true a.And(b) ? true : false //false a.Or(b) ? true : false //true

(+ - unary operators)

> a = new Num('2.5521') //Num { type: 'Num', n2: '', n0: '2', n1: '5521', L_n0: 1, L_n1: 4, n: '2.5521', d: 80 }
> console.log(a.toString());               //2.5521
> console.log(a.Minus().toString());      //-2.5521
> console.log(a.Plus().toString());      //2.5521
> console.log(a.Invsign().toString());  //-2.5521
> console.log(a.Invsign().toString()); //2.5521

bitwise operators code:

num7 = require('num7'); Num = num7.Num; console.log('--- (&) AND ---')
op1 = new Num('3.0')
op2 = 5 console.log(${Num.int(op1).toString(2).padStart(8, '0')}, op1.toString()) //00000011 3.0 op1 = op1.Andb(op2) //AND console.log(${Num.int(op2).toString(2).padStart(8, '0')}, op2) //00000101 5 console.log(${Num.int(op1).toString(2).padStart(8, '0')}, op1.toString()) //00000001 1

console.log('--- (|) OR  ---')  
op1 = new Num('3.0')  
op2 = 5
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00000011 3.0
op1 = op1.Orb(op2)                                                          //OR
console.log(`${Num.int(op2).toString(2).padStart(8, '0')}`, op2)            //00000101 5
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00000111 7

console.log('--- (^) XOR ---')  
op1 = new Num('3.0')  
op2 = 5
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00000011 3.0
op1 = op1.Xorb(op2)                                                         //XOR
console.log(`${Num.int(op2).toString(2).padStart(8, '0')}`, op2)            //00000101 5
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00000110 6

console.log('--- (<<) LEFT SHIFT -X10 MULTIPLIER ---')  
op1 = new Num('1.0')  
op2 = 2
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00000001 1.0
op1 = op1.Shift(op2)                                                        //LEFT SHIFT -X10 MULTIPLIER
console.log(`${Num.int(op2).toString(2).padStart(8, '0')}`, op2)            //00000010 2  
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //01100100 100.0 

console.log('--- (>>) RIGHT SHIFT -X10 DIVIDER ---')  
op1 = new Num('250.0')  
op2 = -1
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //11111010 250.0  
op1 = op1.Shift(op2)                                                        //RIGHT SHIFT -X10 DIVIDER  
console.log(`${op2}`)                                                       //-1 (decimal)
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00011001 25.0

console.log('--- (~) NOT ---')  
op1 = new Num('10.0')  
console.log(`${Num.int(op1).toString(2).padStart(8, '0')}`, op1.toString()) //00001010 10.0   
op2 = op1.Notb()                                                            //(~) NOT 
console.log(`${Num.int(op2).toString(2).padStart(8, '0')}`, op2.toString()) //00000101 5.0

On a given variable the following arithmetic methods are available:

//variable arithmetics  
num7 = require('num7'); Num = num7.Num; 

a = new Num('10.25')  
console.log(a.toString())       //10.25  
a.Inc()        //increment (default) by one  
console.log(a.toString())       //11.25   
a.Dec(2)       //decrement (optional) 2 units  
console.log(a.toString())       //9.25  
a.Incmul()     //multiply (default) 10 times  
console.log(a.toString())       //92.5  
a.Decdiv(100)  //x100 (optional) division  
console.log(a.toString())       //0.925  
a.Clear()      //a variable set to zero   
console.log(a.toString())       //0.0

EVEN ODD numbering methods:

num7 = require('num7'); Num = num7.Num; 

a = new Num(6); b = new Num(3); c = new Num('3.14')  
console.log(a, 'INTEGER =>', a.Is_numint(), 'EVEN =>', a.Is_numeven())   //6.0 INTEGER => true EVEN => true  
console.log(b, 'INTEGER =>', b.Is_numint(), 'ODD  =>', b.Is_numodd())   //3.0 INTEGER => true ODD  => true 
console.log(c, 'FLOAT  =>', c.Is_numfloat())                           //3.14 FLOAT  => true

Advanced logic programming snippet

LOOP EXAMPLE >

num7 = require('num7'); Num = num7.Num; 
i = new Num(0) 
while (i.LT(new Num('1.0'))) {
    i.Inc('0.1')                //i += Num('0.1')
    if (i.LE(new Num('0.5'))) continue
    console.log(i.toString()) //0.6, 0.7, 0.8, 0.9, 1.0  
} 
while (i.Is_true()) {
    i.Dec('0.1')                //i -= Num('0.1') 
    if (i.GE(new Num('0.5'))) continue
    console.log(i.toString()) //0.4 0.3 0.2 0.1 0.0  
}

ROUNDING AND ACCOUNTING >

num7 = require('num7'); Num = num7.Num; 
p = new Num('11.19')                          //PRICE -Toslink cable for soundbar  
pd = Num.round(p.F_price_over(-7))           //PRICE DISCOUNTED 7%
d = Num.round(p.Sub(pd))                    //DISCOUNT
p_noTAX = Num.round(p.F_price_spinoff(22)) //ITEM COST WITHOUT TAX 22%  
TAX = Num.round(p.Sub(p_noTAX))           //TAX 22% 
console.log('price=' + pd.toString() + ' discount=' + d.toString() + ' COST=' + p_noTAX.toString() + ' TAX=' + TAX.toString()) //price=10.41 discount=0.78 COST=9.17 TAX=2.02

OUTPUT FORMATTING AND LOCALIZATION >

num7 = require('num7'); Num = num7.Num; 

const userLang = navigator.language || navigator.userLanguage; 
console.log(userLang);  // e.g., 'it-IT' "en-US", "fr-FR" 
//calculating banking loan 
asset = new Num('100_000.0'); rate = new Num('6.5'); years = new Num('20.0')
monthly_payment = Num.f_fund_fr(asset, rate, years).Round()

const formatted_USD_it = new Intl.NumberFormat("en-US", {
    style: 'currency',
    currency: 'USD',
}).format(monthly_payment);
console.log(formatted_USD_it, ' (USD)');  //$756.30  (USD)

const formatted_EUR_it = new Intl.NumberFormat('it-IT', {
    style: 'currency',
    currency: 'EUR',
}).format(monthly_payment);
console.log(formatted_EUR_it, '(EUR)'); //756,30 € (EUR)

ROUNDING TYPES >

num7 = require('num7'); Num = num7.Num;

//''' Num floor rounding '''  
console.log(''.padStart(20, '-') + ' Num floor rounding')  
n = new Num(Num.pi)                            // 3.141592654  
console.log(n, n.Round_floor(2).toString())   // 3.14  
n = new Num(Num.pi).Invsign()               //-3.141592654  
console.log(n, n.Round_floor(2).toString()) //-3.15
n = new Num(Num.pi).Sub(3)                     // 0.141592654  
console.log(n, n.Round_floor(2).toString())   // 0.14  
n = new Num(Num.pi).Invsign().Add(3)        //-0.141592654  
console.log(n, n.Round_floor(2).toString()) //-0.15  

//''' Num ceil rounding '''  
console.log(''.padStart(20, '-')  + ' Num ceil rounding')  
n = new Num(Num.pi)                          // 3.141592654  
console.log(n, n.Round_ceil(2).toString())  // 3.15  
n = new Num(Num.pi).Invsign()             //-3.141592654  
console.log(n, n.Round_ceil(2).toString())//-3.14  
n = new Num(Num.pi).Sub(3)                    // 0.141592654  
console.log(n, n.Round_ceil(2).toString())   // 0.15  
n = new Num(Num.pi).Invsign().Add(3)       //-0.141592654  
console.log(n, n.Round_ceil(2).toString()) //-0.14  

//''' Num standard rounding '''  
console.log(''.padStart(20, '-') + ' Num standard rounding')  
n = new Num(Num.pi)                      // 3.141592654  
console.log(n, n.Round().toString())    // 3.14  
n = new Num(Num.pi).Invsign()         //-3.141592654  
console.log(n, n.Round().toString())  //-3.14  
n = new Num(Num.pi).Sub(3)               // 0.141592654  
console.log(n, n.Round(4).toString())   // 0.1416  
n = new Num(Num.pi).Invsign().Add(3)  //-0.141592654  
console.log(n, n.Round(4).toString()) //-0.1416  

//''' Num half even rounding '''  
console.log(''.padStart(20, '-') + ' Num half to even rounding (statistic, zero symmetric)')  
n = new Num(Num.pi).Round_floor(4)              // 3.1415  
console.log(n, n.Round_bank(3).toString())     // 3.142  
n = new Num(Num.pi).Round_floor(4).Invsign() //-3.1415  
console.log(n, n.Round_bank(3).toString())   //-3.142  
n = new Num(Num.pi).Sub(3).Round_floor(8)              // 0.14159265  
console.log(n, n.Round_bank(7).toString())            // 0.1415926  
n = new Num(Num.pi).Round_floor(8).Invsign().Add(3) //-0.14159265  
console.log(n, n.Round_bank(7).toString())          //-0.1415926

PERFORMANCE EVALUATION AND SQUARENESS >

num7 = require('num7'); Num = num7.Num

tic = performance.now() //Start Time 
a = new Num('-1.123456789'+'e-100')      //calculating division 10**100... 
toc = performance.now() //Stop Time
T1 = ((toc - tic) / 1000).toFixed(6)
console.log(`a finished sec. ${T1}`) //a finished sec. 0.001129

tic = performance.now() //Start Time 
b = new Num('-1.123456789').Shift(-100)  //calculating division 10**100... 
toc = performance.now() //Stop Time
T2 = ((toc - tic) / 1000).toFixed(6)
console.log(`b finished sec. ${T2}`) //b finished sec. 0.000739

R = Num.f_perf_time(T1, T2)
console.log('PCT=>', Num.round(R[0]).toString(), 'SCALE=>', Num.round(R[1]).toString(), 'SQUARENESS=>', a.EQ(b)) //PCT=> 52.77 SCALE=> 0.53 SQUARENESS=> true

//stock exchange assets performance 
previous = new Num('26.96'); now = new Num('27.27') 
var_pct = new Num(Num.f_perf(previous, now)).Round()
console.log(`${(var_pct > 0 ? '+' : '')}${var_pct.toFixed(2)}`) //+1.15

SCIENTIFIC NOTATION AND HIGH PRECISION RESULTS >

num7 = require('num7'); Num = num7.Num

a = new Num('1_000_000_000_000_000_000_000.0') //standard notation  
b = new Num('1.0e21')                         //scientific notation  
SUM = a.Add(b)                               //SUM  
ieee754 = a.Float() + b.Float() //
console.log('SUM == ieee754', SUM.Int() == Num.int(ieee754), ' SUM =>', SUM.Num2exp()) //SUM == ieee754 True  SUM => 2.0e21  

a = new Num('1_000_000_000_000_000_000_000.0') //standard notation  
b = new Num('1.0e21')                         //scientific notation  
MUL = a.Mul(b)                               //MUL  
ieee754 = a.Float() * b.Float() //
console.log('MUL == ieee754', MUL.Int() == Num.int(ieee754), ' MUL =>', MUL.Num2exp()) //MUL == ieee754 True  MUL => 1.0e42  

a = '1.23456789'  
b = '9.87654321'  
MUL = new Num(a).Mul(new Num(b))    //MUL                        
ieee754 = Number.parseFloat(a) * Number.parseFloat(b)
console.log('MUL == ieee754', MUL == new Num(String(ieee754)), ' MUL =>', MUL.toString(), Number.parseFloat(a)*Number.parseFloat(b), '=> IEEE754 PRECISION FAILURE!') //MUL == ieee754 False MUL => 12.1932631112635269 12.193263111263525 => IEEE754 PRECISION FAILURE!  

a = '1.23456789e320'  //scientific notation  
b = '9.87654321e320'   
MUL = new Num(a).Mul(new Num(b))    //MUL                        
ieee754 = Number.parseFloat(a) * Number.parseFloat(b)
console.log('MUL == ieee754', MUL.toString() == String(ieee754), 'MUL =>', MUL.Num2exp(), Number.parseFloat(a)*Number.parseFloat(b), '=> IEEE754 Infinity FAILURE!') //MUL == ieee754 false MUL => 1.21932631112635269e641 Infinity => IEEE754 Infinity FAILURE!  

a = '2.0e320' //scientific notation  
b = '3.0e-320'  
MUL = new Num(a).Mul(new Num(b))    //MUL                        
ieee754 = Number.parseFloat(a) * Number.parseFloat(b)
console.log('MUL == ieee754', MUL.toString() == ieee754.toString(), 'MUL =>', MUL.Num2exp(), ieee754, '=> IEEE754 Infinity FAILURE!') //MUL == ieee754 false MUL => 6.0e0 Infinity => IEEE754 Infinity FAILURE!  

a = '1.0e200' //scientific notation  
b = '5.0e1200'  
T1 = new Num(a) 
T2 = new Num(b) 
DIV = T1.Div(T2, 1200) //DIV, ultra precision (over 80 digits default) floating point division must be specified! 
ieee754 = Number.parseFloat(a) / (Number.parseFloat(b))
console.log('DIV == ieee754', DIV.toString() == ieee754.toString(), 'DIV =>', DIV.Num2exp(), ieee754, '=> IEEE754 precision FAILURE!') //DIV == ieee754 false DIV => 2.0e-1001 0 => IEEE754 precision FAILURE!

FLOAT TO NUM CONVERSION LIST ARRAY >

num7 = require('num7'); Num = num7.Num

L = [1011, 0.0, 9.998412, 7.0, 0.123, -2.0123, 10, 6]
LN= Num.float2num_list(L)
for(let i of LN) console.log(i.n)           //['1011.0', '0.0', '9.998412', '7.0', '0.123', '-2.0123', '10.0', '6.0']
for(let i of LN) console.log(i.toString()) //[Num('1011.0'), Num('0.0'), Num('9.998412'), Num('7.0'), Num('0.123'), Num('-2.0123'), Num('10.0'), Num('6.0')]

SAVE NUMERIC LIST TO DISK FILE >

num7 = require('num7'); Num = num7.Num

L = [1011, 0.0, 9.998412, 7.0, 0.123, -2.0123, 10, 6]
LN= Num.float2num_list(L)
for(let i of LN) console.log(i.n)           //['1011.0', '0.0', '9.998412', '7.0', '0.123', '-2.0123', '10.0', '6.0']
for(let i of LN) console.log(i.toString()) //[Num('1011.0'), Num('0.0'), Num('9.998412'), Num('7.0'), Num('0.123'), Num('-2.0123'), Num('10.0'), Num('6.0')]
Num.f_filewrite(LN)

READ NUMERIC LIST ARRAY FROM DISK FILE (nums.txt default filename) >

A = Num.f_fileread(); console.log(A) //(8) ['1011.0', '0.0', '9.998412', '7.0', '0.123', '-2.0123', '10.0', '6.0']

FAQ

Q. I usually try to add 0.1 to 0.2 in node with this code:

> console.log(0.1 + 0.2)  
and the result is:  

> 0.30000000000000004

How instead can it gets exactly 0.3?
A. Using Num class >

num7 = require("num7"); Num = num7.Num; calc = num7.Num 
console.log(new Num('0.1').Add(new Num('0.2')).toString())  //as calc.add('0.1', '0.2').toString()

Q. I'll get an error when i usually type:

> new Num(0.1)    

Uncaught Error: Num class constructor => number not valid: 0.1

What is wrong?
A. You must use quotes or string conversion with built-in String function:

> num7 = require("num7"); Num = num7.Num; calc = num7.Num 
> new Num('0.1')    		   //Num('0.1')  
> new Num(String(0.1)).toString() //'0.1'

Q. How can i convert a regular float to a Decimal?
A. With Num.ieee754() method >

num7 = require("num7"); Num = num7.Num; calc = num7.Num  

a=0.1; b=0.2;  
c=a+b                                     //0.30000000000000004 => PRECISION FAILURE!  
an = Num.ieee754(a); console.log(an)      //0.1000000000000000055511151231257827021181583404541015625  
     
bn = Num.ieee754(b); console.log(bn)      //0.2000000000000000111022302462515654042363166809082031250  
cn = Num.ieee754(c);  
console.log(cn, '=> PRECISION FAILURE!')  //0.3000000000000000444089209850062616169452667236328125000 => PRECISION FAILURE!  
T = calc.add(an, bn)  
console.log(T.toString(), '=> OK.')       //0.3000000000000000166533453693773481063544750213623046875 => OK.

Q. I have two float variables in my code:

> a = 0.1; b = 0.2

How can i convert them in Num type?
A. With Num.float2num method (or directly with str() built-in function):

num7 = require("num7"); Num = num7.Num  
a = 0.1; b = 0.2 //  
an= Num.float2num(a); bn= Num.float2num(b) //an= new Num(String(a)); bn= new Num(String(b))  
console.log(an.Add(bn).toString(), 'OK. VS', a+b, 'PRECISION FAILURE!') //0.3 OK. VS 0.30000000000000004 PRECISION FAILURE!

Q. Can i do add or other math operations also with 10,000 digits after floating point?
A. Yes, you can by the following:

num7 = require("num7"); Num = num7.Num 

console.log((new Num('1.123456789e-10_000').Add(new Num('3.987654321e-10_000'))).Num2exp())     //5.11111111e-10000  
console.log((new Num('1.123456789e-10_000').Sub(new Num('3.987654321e-10_000'))).Num2exp())    //-2.864197532e-10000  
console.log((new Num('1.123456789e-10_000').Mul(new Num('3.987654321e-10_000'))).Num2exp())   //4.479957319112635269e-20000  
console.log((new Num('1.123456789e-10_000').Div(new Num('3.987654321e-10_000'))).toString()) //0.28173374584742497292307298769992856660154820877213142969420392746224704666420356

Q. I must enter many integer variables in my code:

> a = new Num('123.0'); b = new Num('456.0'); c = new Num('789.0')

Can i input them without quotes and suffix .0?
A. Yes, this the way:

> a = new Num(123); b = new Num(456); c = new Num(789)

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