float ceilf( float arg );
(1) (since C99)double ceil( double arg );
(2)long double ceill( long double arg );
(3) (since C99)#define ceil( arg )
(4) (since C99)1-3) Computes the smallest integer value not less than arg.
4) Type-generic macro: If arg has type long double, ceill is called. Otherwise, if arg has integer type or the type double, ceil is called. Otherwise, ceilf is called.
If no errors occur, the smallest integer value not less than arg, that is âargâ, is returned.
Return value
Argument
[edit] Error handlingErrors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559):
FE_INEXACT may be (but isn't required to be) raised when rounding a non-integer finite value.
The largest representable floating-point values are exact integers in all standard floating-point formats, so this function never overflows on its own; however the result may overflow any integer type (including intmax_t), when stored in an integer variable.
This function (for double argument) behaves as if (except for the freedom to not raise FE_INEXACT) implemented by
#include <fenv.h>
#include <math.h>
#pragma STDC FENV_ACCESS ON
double ceil(double x)
{
double result;
int save_round = fegetround();
fesetround(FE_UPWARD);
result = rint(x); // or nearbyint
fesetround(save_round);
return result;
}[edit] Example
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("ceil(+2.4) = %+.1f\n", ceil(2.4));
printf("ceil(-2.4) = %+.1f\n", ceil(-2.4));
printf("ceil(-0.0) = %+.1f\n", ceil(-0.0));
printf("ceil(-Inf) = %+f\n", ceil(-INFINITY));
}
Possible output:
ceil(+2.4) = +3.0 ceil(-2.4) = -2.0 ceil(-0.0) = -0.0 ceil(-Inf) = -inf[edit] References
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