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Function std.math.rounding.ceil

Returns the value of x rounded upward to the next integer (toward positive infinity).

real ceil (
  real x
) pure nothrow @nogc @trusted;

double ceil (
  double x
) pure nothrow @nogc @trusted;

float ceil (
  float x
) pure nothrow @nogc @trusted;


import std.math.traits : isNaN;

writeln(ceil(+123.456L)); // +124
writeln(ceil(-123.456L)); // -123
writeln(ceil(-1.234L)); // -1
writeln(ceil(-0.123L)); // 0
writeln(ceil(0.0L)); // 0
writeln(ceil(+0.123L)); // 1
writeln(ceil(+1.234L)); // 2
writeln(ceil(real.infinity)); // real.infinity


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


Boost License 1.0.