How to round integer in java

Question

I want to round the number 1732 to the nearest ten, hundred and thousand. I tried with Math round functions, but it was written only for float and double. How to do this for

Answer 1

Its very easy..

int x = 1234; int y = x - x % 10; //It will give 1230

int y = x - x % 100; //It will give 1200

int y = x - x % 1000; //It will give 1000

The above logic will just convert the last digits to 0. If you want actual round of// For eg. 1278 this should round off to 1280 because last digit 8 > 5 for this i wrote a function check it out.

 private double returnAfterRoundDigitNum(double paramNumber, int noOfDigit)  
    {  
     double tempSubtractNum = paramNumber%(10*noOfDigit);  
     double tempResultNum = (paramNumber - tempSubtractNum);  
     if(tempSubtractNum >= (5*noOfDigit))  
      {  
          tempResultNum = tempResultNum + (10*noOfDigit);  
      }  
      return tempResultNum;  
   }  

Here pass 2 parameters one is the number and the other is position till which you have to round off.

Regards, Abhinav