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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static int countGbl = 0;
  11.  
  12.  
  13.     public static double raise(double base, int exp) {
  14.  
  15.         double b = base;
  16.  
  17.         for (int i = 1; i < exp; i++){
  18.             countGbl += 1;
  19.             base = base * b;
  20.         }
  21.  
  22.         return base;
  23.     }
  24.  
  25.  
  26.     public static double pow1(double base, int exp) {
  27.  
  28.         if (base == 0.0) return Double.POSITIVE_INFINITY;
  29.         else if (base == 0.0 && exp >= 0) return 0.0;
  30.         else if (exp == 1) return base;
  31.         else if (base > 0 && exp == 0) return 1.0;
  32.         else{
  33.             if (exp < 0){
  34.                 base = 1.0/base;
  35.                 exp = -exp;
  36.             }
  37.  
  38.             if (exp % 2 == 0){
  39.                 countGbl++;
  40.                 return pow1(base, exp/2) * pow1(base, exp/2);
  41.             }
  42.             else {
  43.                 countGbl += 2;
  44.                 return pow1(base, exp/2) * pow1(base, exp/2) * base;
  45.             }
  46.         }
  47.     }
  48.  
  49.  
  50.     public static double pow2(double base, int exp) {
  51.         double temp = raise(base, exp/2);
  52.         double retval = temp*temp;
  53.         if (exp % 2 == 1){
  54.             countGbl++;
  55.             retval *= temp;
  56.         }
  57.         return retval;
  58.         }
  59.  
  60.  
  61.  
  62.  
  63.  
  64.     public static void main(String[] args) {
  65.  
  66.         Scanner s = new Scanner(System.in);
  67.  
  68.         System.out.println("Enter base: ");
  69.         double base = Integer.parseInt(s.nextLine());
  70.         System.out.println("Enter exp: ");
  71.         int exp = Integer.parseInt(s.nextLine());
  72.  
  73.         System.out.println(pow2(base, exp));
  74.         System.out.println(countGbl);
  75.  
  76.     }
  77. }
Success #stdin #stdout 0.1s 29492KB
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stdin
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stdout
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Enter base: 
Enter exp: 
4096.0
2
https://ideone.com/b4d5LN
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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