Java Glossary : truncate

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truncate

To take a float or double and want the corresponding integer (possibly as a float, double, int or long) there are four basic algorithms you might use: round, ceil, floor or truncate. With truncate the numbers are always rounded down toward zero. Use i = (int)d;

value	truncate
-1.6	-1
-1.5	-1
-1.4	-1
+1.4	+1
+1.5	+1
+1.6	+1

// Java normally truncates (rounds toward 0 in IEEE jargon)
double x1 = 5673892.61;
long trunc = (long)x1;
// prints 5673892
System.out.println( trunc );

// Sometimes Java appears to round, but that is an illusion
// created because doubles are only accurate to 14 or 15 figures.
double x2 = 5673892111111112.61;
long round = (long)x2;
// prints 5673892111111113
System.out.println( round );

ceil ¤ division ¤ floating point ¤ floor ¤ modulus ¤ round

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