Write a java program, (1)using a random number generator to produce floating poi

Question

Write a  java program, (1)using a random number generator to produce floating point(double) number, use this number to create 4 floating point numbers: the number cutoff at the 3rd,4th,5th, and 6th decimal place.(2)Adjust the random number to round at the 3rd,4th,5th , and 6th decimal place.(3) Use an accumulator to capture each number after it has been calculated.(4)use an accumulator to capture the actual sum of the random numbers.(5) repeat steps 1 through 4 for 10,100,1000, and 10000 repitions. upon completion of each loop, print the real sum, each of the 8 calculated/truncated.

Explanation / Answer

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public class main
{public static void main(String args[])
{double n,temp,sum,roundSum3,roundSum4,roundSum5,roundSum6,cutSum3,cutSum4,cutSum5,cutSum6;
int i,j=10;
for(j=10;j<=10000;j*=j)
{System.out.println(j +" iterations");
   sum=0;
   roundSum3=0;
   cutSum3=0;
   roundSum4=0;
   cutSum4=0;
   roundSum5=0;
   cutSum5=0;
   roundSum6=0;
   cutSum6=0;
   for(i=0;i<j;i++)
     {n=Math.random();
     //if(j==10)
       // System.out.println(n);
     sum+=n;
     cutSum3=cutSum3+(int)(n*1000.)/1000.;
     cutSum4=cutSum4+(int)(n*10000.)/10000.;
     cutSum5=cutSum5+(int)(n*10000.)/10000.;
     cutSum6=cutSum6+(int)(n*1000000.)/1000000.;
     roundSum3=roundSum3+(int)((n+.0005)*1000.)/1000.;
     roundSum4=roundSum4+(int)((n+.00005)*10000.)/10000.;
     roundSum5=roundSum5+(int)((n+.000005)*10000.)/10000.;
     roundSum6=roundSum6+(int)((n+.0000005)*1000000.)/1000000.;
     }
   System.out.printf("sum of the numbers as generated: %f ",sum);
    System.out.printf("sum of the numbers rounded 3 places: %.3f ",roundSum3);
     System.out.printf("sum of the numbers rounded 4 places: %.4f ",roundSum4);
     System.out.printf("sum of the numbers rounded 5 places: %.5f ",roundSum5);
     System.out.printf("sum of the numbers rounded 6 places: %.6f ",roundSum6);
     System.out.printf("sum of the numbers truncated after 3 places :%.3f ",cutSum3);
     System.out.printf("sum of the numbers truncated after 4 places : %.4f ",cutSum4);
      System.out.printf("sum of the numbers truncated after 5 places : %.5f ",cutSum5);
     System.out.printf("sum of the numbers truncated after 6 places : %.6f ",cutSum6);
    }
}
}

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