ceil, ceill
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Header File
math.h
Category
Math Routines
Prototype
double ceil(double x);
long double ceill(long double x);
Description
Rounds up.
ceil finds the smallest integer not less than x.
ceill is the long double version; it takes a long double argument and returns a long double result.
Return Value
These functions return the integer found as a double (ceil) or a long double (ceill).
Example
#include <math.h>
#include <stdio.h>
int main(void)
{
double number = 123.54;
double down, up;
down = floor(number);
up = ceil(number);
printf("original number %5.2lf\n", number);
printf("number rounded down %5.2lf\n", down);
printf("number rounded up %5.2lf\n", up);
return 0;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
---|---|---|---|---|
ceil |
+ |
+ |
+ |
+ |
ceill |
+ |
+ |
+ |