ceil()
Published Jul 16, 2021Updated Jul 31, 2023
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The ceil()
function returns the next whole number that is greater than or equal to the argument.
Syntax
std::ceil(n);
Argument must be a double
/float
/long double
, and the return value will be same type.
Example
Use ceil()
to round up some math constants:
#include <iostream>#include <cmath>int main() {double pi = M_PI;double e = M_Edouble a;double b;a = std::ceil(pi);b = std::ceil(e);std::cout << "Pi rounded up is " << a << "!\n";std::cout << "e rounded up is " << b << "!\n";}
This results in the following output:
Pi rounded up is 4!e rounded up is 3!
Codebyte Example
Use ceil()
function to round up the double 12.3456
:
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