Solve the bug of JS floating point number (decimal) computing addition, subtraction, multiplication, division

1   /*  *  2   ** The addition function is used to obtain accurate addition results.  3   ** Note: The addition result of JavaScript has an error, which is obvious when two floating point numbers are added. This function returns a more accurate addition result.  4   ** Call: accadd (arg1, arg2)  5   ** Return value: exact result of adding arg1 to arg2  6   *  */  7   Function Accadd (arg1, arg2 ){  8       VaR  R1, R2, M, C;  9       Try  {  10 R1 = arg1.tostring (). Split (".") [1 ]. Length;  11   }  12       Catch  (E ){  13 R1 = 0 ; 14   }  15       Try  {  16 R2 = arg2.tostring (). Split (".") [1 ]. Length;  17   }  18       Catch  (E ){  19 R2 = 0 ;  20   } 21 C = math. Abs (R1- R2 );  22 M = math. Pow (10 , Math. Max (R1, R2 ));  23       If (C> 0 ){  24           VaR Cm = math. Pow (10 , C );  25           If (R1> R2 ){  26 Arg1 = Number (arg1.tostring (). Replace (".",""));  27 Arg2 = Number (arg2.tostring (). Replace (".",""))* Cm;  28 } Else  {  29 Arg1 = Number (arg1.tostring (). Replace (".",""))* Cm;  30 Arg2 = Number (arg2.tostring (). Replace (".","" ));  31   }  32 }Else  {  33 Arg1 = Number (arg1.tostring (). Replace (".","" ));  34 Arg2 = Number (arg2.tostring (). Replace (".","" ));  35   }  36       Return (Arg1 + arg2 )/ M;  37   }  38   39  //  Add an add method to the number type to facilitate calling.  40 Number. Prototype. Add = Function  (ARG ){  41       Return Accadd (ARG, This  );  42 };

 1   /*  *  2   ** Subtraction function, used to obtain accurate subtraction results  3  ** Note: javascript subtraction results in errors, which are obvious when two floating point numbers are subtracted. This function returns a more precise subtraction result.  4   ** Call: accsub (arg1, arg2)  5   ** Return value: exact result of adding arg1 to arg2  6   *  */  7   Function  Accsub (arg1, arg2 ){  8       VaR  R1, R2, M, N;  9       Try {  10 R1 = arg1.tostring (). Split (".") [1 ]. Length;  11   }  12       Catch  (E ){  13 R1 = 0 ;  14   }  15       Try  {  16 R2 = arg2.tostring (). Split (".") [1 ]. Length;  17   }  18       Catch  (E ){  19 R2 = 0 ;  20   }  21 M = math. Pow (10, math. Max (R1, R2 )); //  Last modify by deeka // dynamically control the Precision Length  22 N = (r1> = R2 )?R1: R2;  23       Return (Arg1 * m-arg2 * m )/ M). tofixed (N );  24   }  25   26   //  Add a mul Method to the number type to facilitate calling.  27 Number. Prototype. sub = Function  (ARG ){  28       Return Accmul (ARG,This  );  29 };

 1   /*  *  2   ** Multiplication function, used to obtain accurate multiplication results  3   ** Note: there is an error in the Javascript multiplication result, which is obvious when two floating point numbers are multiplied. This function returns a more accurate multiplication result.  4   ** Call: accmul (arg1, arg2)  5   ** Return value: exact result of multiplying arg1 by arg2  6   * */  7   Function  Accmul (arg1, arg2 ){  8       VaR M = 0, S1 = arg1.tostring (), S2 = Arg2.tostring ();  9       Try  {  10 M + = s1.split (".") [1 ]. Length;  11   }  12       Catch (E ){  13   }  14       Try  {  15 M + = s2.split (".") [1 ]. Length;  16   }  17       Catch  (E ){  18   }  19       Return Number (s1.replace (".", "") * Number (s2.replace (".", "")/Math. Pow (10 , M );  20   }  21   22   //  Add a mul Method to the number type to facilitate calling.  23 Number. Prototype. Mul = Function  (ARG ){  24       Return Accmul (ARG, This  );  25 };

 1   /*  *  2   ** Division function, used to obtain accurate division results  3   ** Note: there is an error in the division result of JavaScript, which is obvious when two floating point numbers are separated. This function returns a more precise division result.  4   ** Call: accdiv (arg1, arg2)  5   ** Return value: the exact result of dividing arg1 by arg2  6   *  */  7   Function Accdiv (arg1, arg2 ){  8       VaR T1 = 0, T2 = 0 , R1, R2;  9       Try  {  10 T1 = arg1.tostring (). Split (".") [1 ]. Length;  11   }  12       Catch  (E ){  13   } 14       Try  {  15 T2 = arg2.tostring (). Split (".") [1 ]. Length;  16   }  17       Catch  (E ){  18   }  19       With  (Math ){  20 R1 = Number (arg1.tostring (). Replace (".","" ));  21 R2 = Number (arg2.tostring (). Replace (".","" ));  22           Return (R1/R2) * POW (10, T2- T1 );  23   }  24   }  25   26   //  Add a div Method to the number type to facilitate calling. 27 Number. Prototype. DIV = Function  (ARG ){  28       Return Accdiv ( This  , ARG );  29 };