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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class SinusApp
  6. {
  7.    public static Double scanDouble( Scanner in )
  8.    {
  9. 	   return ( ( in.hasNextDouble() ) ? in.nextDouble() : null );
  10.    }
  11.  
  12.    public static double pow2( double x ) //вторая степень
  13.    {
  14.       return x*x;
  15.    }
  16.  
  17.    public static void main( String[] args )
  18.    {
  19.       // рабочие переменные
  20.       double x, e, d, r;
  21.       long n, nMax = Long.MAX_VALUE; // лимит числа итераций чтобы избежать бесконечного цикла
  22.  
  23.  
  24.       // ввод данных - аргумента функции и заданной погрешности
  25.       Scanner in = new Scanner(System.in);
  26.  
  27.       x = scanDouble( in );
  28.       e = scanDouble( in );
  29.  
  30.       in.close(); 
  31.  
  32.       for( d = 0, r = x, n = 2; n < nMax; n++ ) // основной цикл вычислений
  33.       {
  34.          r = r * ( 1 - pow2( x ) / ( pow2( n - 1 ) * pow2( Math.PI ) ) );
  35.          d = Math.sin( x ) - r ;  
  36.          if( Math.abs( d ) <= Math.abs( e ) ) break;
  37.       }      
  38.  
  39.       // вывод результата
  40.       System.out.printf("sin(x) = %f\n", Math.sin( x ) );
  41.       System.out.printf("calculated sinus = %f\n", r );
  42.       System.out.printf("inaccuracy = %f\n", d );
  43.       System.out.printf("number of iterations: %d\n", n );
  44.  
  45.    }
  46. }
  47.  
Success #stdin #stdout 0.18s 322368KB
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stdin
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12 0.56
stdout
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sin(x) = -0.536573
calculated sinus = -1.061362
inaccuracy = 0.524789
number of iterations: 22
https://ideone.com/nZluY8
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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