6.11.159 roundl Function
Returns the double precision floating-point argument rounded to an integer value.
Include
<math.h>
Prototype
long double roundl(long double x);
Argument
x
- the value to round
Return Value
Returns the value of x
rounded to the nearest integer value, always
rounding midway cases away from zero. The rounded integer is returned as a long double
precision floating-point value.
Example
See the notes at the beginning of this chapter or section for
information on using printf()
or scanf()
(and other functions reading and writing the stdin
or
stdout
streams) in the example code.
#include <math.h>
#include <stdio.h>
int main(void)
{
long double x, y;
x = 10.103;
y = roundl(x);
printf("The nearest integer value to %Lf is %Lf\n", x, y);
x = 10.5;
y = roundl(x);
printf("The nearest integer value to %Lf is %Lf\n", x, y);
}
Example Output
The nearest integer value to 10.103000 is 10.000000
The nearest integer value to 10.500000 is 11.000000