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Function `std.math.lrint`

Rounds x to the nearest integer value, using the current rounding mode.


						
				long lrint
				(
				

				  real x
				

				) pure nothrow @nogc @trusted;

This is generally the fastest method to convert a floating-point number to an integer. Note that the results from this function depend on the rounding mode, if the fractional part of x is exactly 0.5. If using the default rounding mode (ties round to even integers) lrint(4.5) == 4, lrint(5.5)==6.

Example

writeln(lrint(4.5)); // 4
writeln(lrint(5.5)); // 6
writeln(lrint(-4.5)); // -4
writeln(lrint(-5.5)); // -6

writeln(lrint(int.max - 0.5)); // 2147483646L
writeln(lrint(int.max + 0.5)); // 2147483648L
writeln(lrint(int.min - 0.5)); // -2147483648L
writeln(lrint(int.min + 0.5)); // -2147483648L

Authors

Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger

License

Boost License 1.0.