function
<cmath> <ctgmath>
lrint
long int lrint (double x);long int lrintf (float x);long int lrintl (long double x);
long int lrint (double x);long int lrint (float x);long int lrint (long double x);long int lrint (T x); // additional overloads for integral types
Round and cast to long integer
Rounds x to an integral value, using the rounding direction specified by fegetround, and returns it as a value of type long int.
See llrint for an equivalent function that returns a long long int.
Header
<tgmath.h> provides a type-generic macro version of this function.
Additional overloads are provided in this header (
<cmath>) for the
integral types: These overloads effectively cast
x to a
double before calculations (defined for
T being any
integral type).
Parameters
- x
- Value to round.
Example
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/* lrint example */
#include <stdio.h> /* printf */
#include <fenv.h> /* fegetround, FE_* */
#include <math.h> /* lrint */
int main ()
{
printf ("rounding using ");
switch (fegetround()) {
case FE_DOWNWARD: printf ("downward"); break;
case FE_TONEAREST: printf ("to-nearest"); break;
case FE_TOWARDZERO: printf ("toward-zero"); break;
case FE_UPWARD: printf ("upward"); break;
default: printf ("unknown");
}
printf (" rounding:\n");
printf ( "lrint (2.3) = %ld\n", lrint(2.3) );
printf ( "lrint (3.8) = %ld\n", lrint(3.8) );
printf ( "lrint (-2.3) = %ld\n", lrint(-2.3) );
printf ( "lrint (-3.8) = %ld\n", lrint(-3.8) );
return 0;
}
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Possible output:
Rounding using to-nearest rounding:
lrint (2.3) = 2
lrint (3.8) = 4
lrint (-2.3) = -2
lrint (-3.8) = -4
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See also
- nearbyint
- Round to nearby integral value (function)
- rint
- Round to integral value (function)
- llrint
- Round and cast to long long integer (function)
- round
- Round to nearest (function)
- floor
- Round down value (function)
- ceil
- Round up value (function)
- trunc
- Truncate value (function)