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  1. public class Main {
  2.  
  3.     static String testcase1 = "-2x^3+10x-4x^2";
  4.     static String testcase2 = "3";
  5.  
  6.     public static void main(String args[]){
  7.         int result = eval(testcase1,testcase2);
  8.         System.out.println("Result : "+result);
  9.     }
  10.  
  11.     public static int eval(String str,String valx){
  12.         int sum = 0;        
  13.         String subStr = "";
  14.  
  15.          int len = str.length();
  16.          for (int i = 0; i <= len; i++)
  17.          {
  18.              if(i == len || str.charAt(i) == '-' || str.charAt(i) == '+')
  19.              {
  20.                  subStr = str.substring(0, i);
  21.                  System.out.println("subStr="+subStr);
  22.                  sum += evalSubPoly(subStr, valx);
  23.                  if (i != len && str.charAt(i) == '+')
  24.                    str = str.substring(i+1);
  25.                  else
  26.                    str = str.substring(i);
  27.                  System.out.println(str);
  28.                  len = str.length();
  29.                  i = 0;
  30.              }               
  31.          }
  32.         return sum;
  33.     }
  34.  
  35.     public static int evalSubPoly(String poly,String valx){
  36.         int len = poly.length();
  37.         String num = "";
  38.         String power = "";
  39.         int exp = 0, coeff = 0;
  40.  
  41.         for(int i = 0; i < len; i++)
  42.         {
  43.             if(poly.charAt(i) == 'x')
  44.             {
  45.                 num = poly.substring(0, i);
  46.                 coeff = Integer.parseInt(num);                              
  47.             }
  48.             if(poly.charAt(i) == '^')
  49.             {
  50.                 power = poly.substring(i+1, len);
  51.                 exp = Integer.parseInt(power);
  52.             }                       
  53.         }
  54.  
  55.         if(power.equals(""))
  56.             exp = 1;
  57.         System.out.println("coeff="+coeff);
  58.  
  59.         int sum = 1;
  60.         int x = Integer.parseInt(valx);
  61.  
  62.         for (int i = 0; i < exp; i++)
  63.         {
  64.             sum = sum*x;
  65.         }
  66.         System.out.println("sum="+sum);
  67.         sum = sum*coeff;
  68.  
  69.         return sum;
  70.     }
  71. }
Success #stdin #stdout 0.08s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
subStr=
coeff=0
sum=3
-2x^3+10x-4x^2
subStr=-2x^3
coeff=-2
sum=27
10x-4x^2
subStr=10x
coeff=10
sum=3
-4x^2
subStr=-4x^2
coeff=-4
sum=9

Result : -60
https://ideone.com/ikOFlX
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
secret

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