java - to check how many roots are real - 


import java.util.scanner; public class fileoutputstreamexample {   public static int count;    public void equation(int a, int b,int c)   {      int e=(b*b)-(4*a*c);     double f=math.pow(e,1/2);     if(f>=0)         count=count++;    }  public static void main (string []args)  {     fileoutputstreamexample fos= new fileoutputstreamexample();     scanner sc= new scanner(system.in);     int n= sc.nextint();     for(int i=1;i<=n;i++)     {        int a= sc.nextint();        int b= sc.nextint();        int c= sc.nextint();        fos.equation(a, b, c);     }      system.out.println("ans "+count);    } }

here writing code check if given n inputs of quadratic equation having having coefficients a,b,c how many of given n inputs have real roots. code compiles possible results in ans=0 time. count not working in case.

count=count++;

this line nothing. increments count, returns value expression, stored in count. since ++ @ end, value being stored original value of count, undoing increment. :)

when using increment (or decrement) operators, don't have use assignment operator modify value. increment implies modification variable.

fix changing to: count++;

in addition that, 1/2 equal zero, since operands integers, , such, division applied integer division (which truncates decimal parts) rather division you're expecting.

change 1.0/2 or .5


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