How to round decimal of double in java

Do either epsilon comparison or fixed number of iterations.

Epsilon comparison:

ouble epsilon = 1e-6; // adjust for more precision (1e-7) while (high - low > epsilon) { double mid = low + (high - low) / 2.0; if (check(mid)) { low = mid; } else { high = mid; } }

Fixed number of iterations:

for (int i = 0; i < 100; i++) { double mid = low + (high - low) / 2.0; if (check(mid)) { low = mid; } else { high = mid; } }

You can search for your number by assigning a tolerance margin for the result, something like:

double tolerance = 0.000005, objetive = 0.000235, min = objetive - tolerance, max = objetive + tolerance, list[] = { 0.0001, 0.00023, 0.00024 }; for( int i = 0; i < list.length; i++ ) { if( min < list[ i ] && max > list[ i ] ) { System.out.println( "Eureka" ); System.out.println( i ); break; } }