Java Math.round() Method
DevSniper
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public static int round(float x) public static long round(double x)
In Programming, precise handling of numerical data especially when dealing with floating-point numbers. Java offers a variety of methods in its standard library to manage numeric operations effectively. One such method is Java Math.round. Java Math.round() is a in-build static method that is present in Java.lang.Math class. Java Math.round() method plays crucial role in rounding decimal numbers to the nearest integer.
- If the numbers with a fractional part less than 0.5 are rounded down (towards the smaller integer).
- If the numbers with a fractional part greater than or equal to 0.5 are rounded up (towards the larger integer).
- If the parameter is a decimal value, either positive or negative, this method will return the nearest Integer/long value.
- If the parameter is positive Infinity this method will return Integer.MAX_VALUE (float parameter) OR Long.MAX_VALUE (double parameter). Visit section Java Math.round With Positive Infinity.
- If the parameter is negative Infinity this method will return Integer.MIN_VALUE (float parameter) OR Long.MIN_VALUE (double parameter) . visit section Java Math.round With Negative Infinity
- If the parameter is NaN this method will return Zero.
Math.round With Positive Number
public class Program
{
public static void main(String []args)
{
System.out.println("Math.round(10) = "+ Math.round(10));
System.out.println("Math.round(10L) = "+ Math.round(10L));
System.out.println("Math.round(10f) = "+ Math.round(10f));
System.out.println("Math.round(10.0) = "+ Math.round(10.0));
System.out.println("Math.round(9.7f) = "+ Math.round(9.7f));
System.out.println("Math.round(9.5f) = "+ Math.round(9.5f));
System.out.println("Math.round(9.1f) = "+ Math.round(9.1f));
System.out.println("Math.round(9.7) = "+ Math.round(9.7));
System.out.println("Math.round(9.5) = "+ Math.round(9.5));
System.out.println("Math.round(9.1) = "+ Math.round(9.1));
}
}Math.round(10) = 10 Math.round(10L) = 10 Math.round(10f) = 10 Math.round(10.0) = 10 Math.round(9.7f) = 10 Math.round(9.5f) = 10 Math.round(9.1f) = 9 Math.round(9.7) = 10 Math.round(9.5) = 10 Math.round(9.1) = 9
Math.round With Negative Number
public class Program
{
public static void main(String []args)
{
System.out.println("Math.round(-10) = "+ Math.round(-10));
System.out.println("Math.round(-10L) = "+ Math.round(-10L));
System.out.println("Math.round(-10f) = "+ Math.round(-10f));
System.out.println("Math.round(-10.0) = "+ Math.round(-10.0));
System.out.println("Math.round(-9.7f) = "+ Math.round(-9.7f));
System.out.println("Math.round(-9.5f) = "+ Math.round(-9.5f));
System.out.println("Math.round(-9.1f) = "+ Math.round(-9.1f));
System.out.println("Math.round(-9.7) = "+ Math.round(-9.7));
System.out.println("Math.round(-9.5) = "+ Math.round(-9.5));
System.out.println("Math.round(-9.1) = "+ Math.round(-9.1));
}
}Math.round(-10) = -10 Math.round(-10L) = -10 Math.round(-10f) = -10 Math.round(-10.0) = -10 Math.round(-9.7f) = -10 Math.round(-9.5f) = -9 Math.round(-9.1f) = -9 Math.round(-9.7) = -10 Math.round(-9.5) = -9 Math.round(-9.1) = -9
Java Math.round With Positive Infinity
public class Program
{
public static void main(String []args)
{
System.out.println("Math.round(10/0.0) = "+ Math.round(10/0.0) );
System.out.println("Math.round(10L/0.0) = "+ Math.round(10L/0.0) );
System.out.println("Math.round(10f/0.0) = "+ Math.round(10/0.0) );
System.out.println("Math.round(10.1/0.0) = "+ Math.round(10.1/0.0) );
System.out.println("Math.round(10f/0) = "+ Math.round(10f/0) );
System.out.println("Math.round(10f/-0) = "+ Math.round(10f/-0) );
System.out.println("Math.round(-10/-0f) = "+ Math.round(-10/-0f) );
System.out.println("Math.round(10.1/0) = "+ Math.round(10.1/0) );
System.out.println("Math.round(10.1/-0) = "+ Math.round(10.1/-0) );
System.out.println("Math.round(-10.1/-0.0) = "+ Math.round(-10/-0.0) );
}
}Math.round(10/0.0) = 9223372036854775807 Math.round(10L/0.0) = 9223372036854775807 Math.round(10f/0.0) = 9223372036854775807 Math.round(10.1/0.0) = 9223372036854775807 Math.round(10f/0) = 2147483647 Math.round(10f/-0) = 2147483647 Math.round(-10/-0f) = 2147483647 Math.round(10.1/0) = 9223372036854775807 Math.round(10.1/-0) = 9223372036854775807 Math.round(-10.1/-0.0) = 9223372036854775807
Java Math.round With Negative Infinity
public class Program
{
public static void main(String []args)
{
System.out.println("Math.round(10/-0.0) = "+ Math.round(10/-0.0) );
System.out.println("Math.round(10L/-0.0) = "+ Math.round(10L/-0.0) );
System.out.println("Math.round(10f/-0.0) = "+ Math.round(10f/-0.0) );
System.out.println("Math.round(-10f/0.0) = "+ Math.round(-10f/0.0) );
System.out.println("Math.round(-10f/0) = "+ Math.round(-10f/0) );
System.out.println("Math.round(10.1/-0.0) = "+ Math.round(10.1/-0.0) );
System.out.println("Math.round(-10.1/0.0) = "+ Math.round(-10.1/0.0) );
System.out.println("Math.round(-10.1/0) = "+ Math.round(-10.1/0) );
}
}Math.round(10/-0.0) = -9223372036854775808 Math.round(10L/-0.0) = -9223372036854775808 Math.round(10f/-0.0) = -9223372036854775808 Math.round(-10f/0.0) = -9223372036854775808 Math.round(-10f/0) = -2147483648 Math.round(10.1/-0.0) = -9223372036854775808 Math.round(-10.1/0.0) = -9223372036854775808 Math.round(-10.1/0) = -9223372036854775808
Java Math.round With NaN
public class Program
{
public static void main(String []args)
{
System.out.println("Math.round(0/0.0) = "+ Math.round(0/0.0) );
System.out.println("Math.round(0/-0.0) = "+ Math.round(0/-0.0) );
System.out.println("Math.round(-0/0.0) = "+ Math.round(-0/0.0) );
System.out.println("Math.round(-0/-0.0) = "+ Math.round(-0/-0.0) );
System.out.println("Math.round(0/0f) = "+ Math.round(0/0f) );
System.out.println("Math.round(0/-0f) = "+ Math.round(0/-0f) );
System.out.println("Math.round(-0/0f) = "+ Math.round(-0/0f) );
System.out.println("Math.round(-0/-0f) = "+ Math.round(-0/-0f) );
}
}Math.round(0/0.0) = 0 Math.round(0/-0.0) = 0 Math.round(-0/0.0) = 0 Math.round(-0/-0.0) = 0 Math.round(0/0f) = 0 Math.round(0/-0f) = 0 Math.round(-0/0f) = 0 Math.round(-0/-0f) = 0
Java Math.round Behavior With Integer.MIN_VALUE ,Integer.MAX_VALUE, Long.MIN_VALUE and Long.MAX_VALUE
Long.MIN_VALUE = -9223372036854775808 Integer.MIN_VALUE = -2147483648 Long.MAX_VALUE = 9223372036854775807 Integer.MAX_VALUE = 2147483647
public class Program
{
public static void main(String []args)
{
System.out.println("Math.round(Long.MIN_VALUE) = "+Math.round(Long.MIN_VALUE));
System.out.println("Math.round(Integer.MIN_VALUE) = "+Math.round(Integer.MIN_VALUE));
System.out.println("Math.round(Long.MAX_VALUE) = "+Math.round(Long.MAX_VALUE));
System.out.println("Math.round(Integer.MAX_VALUE) = "+Math.round(Integer.MAX_VALUE));
System.out.println("Math.round((long)Long.MIN_VALUE) = "+Math.round((long)Long.MIN_VALUE));
System.out.println("Math.round((long)Integer.MIN_VALUE) = "+Math.round((long)Integer.MIN_VALUE));
System.out.println("Math.round((long)Long.MAX_VALUE) = "+Math.round((long)Long.MAX_VALUE));
System.out.println("Math.round((long)Integer.MAX_VALUE) = "+Math.round((long)Integer.MAX_VALUE));
System.out.println("Math.round((float)Long.MIN_VALUE) = "+Math.round((float)Long.MIN_VALUE));
System.out.println("Math.round((float)Integer.MIN_VALUE) = "+Math.round((float)Integer.MIN_VALUE));
System.out.println("Math.round((float)Long.MAX_VALUE) = "+Math.round((float)Long.MAX_VALUE));
System.out.println("Math.round((float)Integer.MAX_VALUE) = "+Math.round((float)Integer.MAX_VALUE));
System.out.println("Math.round((double)Long.MIN_VALUE) = "+Math.round((double)Long.MIN_VALUE));
System.out.println("Math.round((double)Integer.MIN_VALUE) = "+Math.round((double)Integer.MIN_VALUE));
System.out.println("Math.round((double)Long.MAX_VALUE) = "+Math.round((double)Long.MAX_VALUE));
System.out.println("Math.round((double)Integer.MAX_VALUE) = "+Math.round((double)Integer.MAX_VALUE));
}
}Math.round(Long.MIN_VALUE) = -2147483648 Math.round(Integer.MIN_VALUE) = -2147483648 Math.round(Long.MAX_VALUE) = 2147483647 Math.round(Integer.MAX_VALUE) = 2147483647 Math.round((long)Long.MIN_VALUE) = -2147483648 Math.round((long)Integer.MIN_VALUE) = -2147483648 Math.round((long)Long.MAX_VALUE) = 2147483647 Math.round((long)Integer.MAX_VALUE) = 2147483647 Math.round((float)Long.MIN_VALUE) = -2147483648 Math.round((float)Integer.MIN_VALUE) = -2147483648 Math.round((float)Long.MAX_VALUE) = 2147483647 Math.round((float)Integer.MAX_VALUE) = 2147483647 Math.round((double)Long.MIN_VALUE) = -9223372036854775808 Math.round((double)Integer.MIN_VALUE) = -2147483648 Math.round((double)Long.MAX_VALUE) = 9223372036854775807 Math.round((double)Integer.MAX_VALUE) = 2147483647
Java Math.round With Integer.MIN_VALUE
public class Program
{
public static void main(String []args)
{
System.out.println("Integer.MIN_VALUE = "+Integer.MIN_VALUE);
System.out.println("Integer.MAX_VALUE = "+Integer.MAX_VALUE);
System.out.println("Math.round(Integer.MIN_VALUE) = "+Math.round(Integer.MIN_VALUE));
System.out.println("Math.round((long)Integer.MIN_VALUE) = "+Math.round((long)Integer.MIN_VALUE));
System.out.println("Math.round((float)Integer.MIN_VALUE) = "+Math.round((float)Integer.MIN_VALUE));
System.out.println("Math.round((double)Integer.MIN_VALUE) = "+Math.round((double)Integer.MIN_VALUE));
System.out.println("Integer.MIN_VALUE -1 = "+(Integer.MIN_VALUE-1));
System.out.println("Math.round(Integer.MIN_VALUE-1) = "+Math.round((Integer.MIN_VALUE-1)));
System.out.println("Math.round((long)(Integer.MIN_VALUE-1)) = "+Math.round((long)(Integer.MIN_VALUE-1)));
System.out.println("Math.round((float)(Integer.MIN_VALUE-1)) = "+Math.round((float)(Integer.MIN_VALUE-1)));
System.out.println("Math.round((double)(Integer.MIN_VALUE-1)) = "+Math.round((double)(Integer.MIN_VALUE-1)));
System.out.println("Integer.MIN_VALUE -1.0 = "+(Integer.MIN_VALUE-1.0));
System.out.println("Math.round(Integer.MIN_VALUE-1.0) = "+Math.round((Integer.MIN_VALUE-1.0)));
System.out.println("Math.round((long)(Integer.MIN_VALUE-1.0)) = "+Math.round((long)(Integer.MIN_VALUE-1.0)));
System.out.println("Math.round((float)(Integer.MIN_VALUE-1.0)) = "+Math.round((float)(Integer.MIN_VALUE-1.0)));
System.out.println("Math.round((double)(Integer.MIN_VALUE-1.0)) = "+Math.round((double)(Integer.MIN_VALUE-1.0)));
System.out.println("Integer.MIN_VALUE -5 = "+(Integer.MIN_VALUE-5));
System.out.println("Math.round(Integer.MIN_VALUE-5) = "+Math.round((Integer.MIN_VALUE-5)));
System.out.println("Math.round((long)(Integer.MIN_VALUE-5)) = "+Math.round((long)(Integer.MIN_VALUE-5)));
System.out.println("Math.round((float)(Integer.MIN_VALUE-5)) = "+Math.round((float)(Integer.MIN_VALUE-5)));
System.out.println("Math.round((double)(Integer.MIN_VALUE-5)) = "+Math.round((double)(Integer.MIN_VALUE-5)));
}
}Integer.MIN_VALUE = -2147483648 Integer.MAX_VALUE = 2147483647 Math.round(Integer.MIN_VALUE) = -2147483648 Math.round((long)Integer.MIN_VALUE) = -2147483648 Math.round((float)Integer.MIN_VALUE) = -2147483648 Math.round((double)Integer.MIN_VALUE) = -2147483648 Integer.MIN_VALUE -1 = 2147483647 Math.round(Integer.MIN_VALUE-1) = 2147483647 Math.round((long)(Integer.MIN_VALUE-1)) = 2147483647 Math.round((float)(Integer.MIN_VALUE-1)) = 2147483647 Math.round((double)(Integer.MIN_VALUE-1)) = 2147483647 Integer.MIN_VALUE -1.0 = -2.147483649E9 Math.round(Integer.MIN_VALUE-1.0) = -2147483649 Math.round((long)(Integer.MIN_VALUE-1.0)) = -2147483648 Math.round((float)(Integer.MIN_VALUE-1.0)) = -2147483648 Math.round((double)(Integer.MIN_VALUE-1.0)) = -2147483649 Integer.MIN_VALUE -5 = 2147483643 Math.round(Integer.MIN_VALUE-5) = 2147483647 Math.round((long)(Integer.MIN_VALUE-5)) = 2147483647 Math.round((float)(Integer.MIN_VALUE-5)) = 2147483647 Math.round((double)(Integer.MIN_VALUE-5)) = 2147483643