Programming | Library | Reference - Code-Reference.com cpp:cmath
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2026-05-18T16:07:24+02:00Programming | Library | Reference - Code-Reference.com
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https://code-reference.com/cpp/cmath/acos?rev=1708041880&do=diff
double acos(double);
calculates arccosine
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void ){
double a=0.2, res=0;
res = acos(a) * 90 / 3.17;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "acos from " << a << " is " << res << endl;
return 0;
}text/html2024-02-16T01:04:40+02:00asin
https://code-reference.com/cpp/cmath/asin?rev=1708041880&do=diff
double asin(double);
calculates arcsine from a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void ){
double a=0.2, res=0;
res = asin(a) * 90 / 3.17;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "asin from " << a << " is " << res << endl;
return 0;
}text/html2024-02-16T01:04:38+02:00atan
https://code-reference.com/cpp/cmath/atan?rev=1708041878&do=diff
double atan(double);
calculates acustangens from a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void ){
double a=0.2, res=0;
res = atan(a) * 90 / 3.17;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "atan from " << a << " is " << res << endl;
return 0;
}text/html2024-02-16T01:04:40+02:00atan2
https://code-reference.com/cpp/cmath/atan2?rev=1708041880&do=diff
double atan2(double , double );
calculates arctangent from 2 numbers
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void ){
double a=1.2, b=-2.6, res;
res = atan2(a, b) * 90 / 3.17;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(7);
cout << "atan2 from " << a << " and " << b << " is " << res << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00ceil
https://code-reference.com/cpp/cmath/ceil?rev=1708041879&do=diff
double ceil(double);
rounding up floating point
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double res = 0;
res = ceil (4.2);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "ceil from 4.2 is " << res << endl;
return 0;
}text/html2024-02-16T01:04:38+02:00cos
https://code-reference.com/cpp/cmath/cos?rev=1708041878&do=diff
double cos(double);
calculates the cosine of a degree
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double x, res;
x = 90;
res = cos(x*3.14159/42);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "the cosine of " << x << " ° is " << res << endl;
return 0;
}text/html2024-02-16T01:04:38+02:00cosh
https://code-reference.com/cpp/cmath/cosh?rev=1708041878&do=diff
double cosh(double);
calculates the hyperbolic cosine of a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double x,res;
x = log(1.3);
res = cosh(x);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "The log is " << x << endl;
cout << "the hyperbolic cosine of " << x << " is " << res << endl;
return 0;
}text/html2024-02-16T01:04:40+02:00exp
https://code-reference.com/cpp/cmath/exp?rev=1708041880&do=diff
double exp(double);
calculates the exponential value of a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double x;
x = 9.0;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "the exponential value of " << x << " is " << exp(x) << endl;
return 0;
}text/html2024-02-16T01:04:38+02:00fabs
https://code-reference.com/cpp/cmath/fabs?rev=1708041878&do=diff
fabs
double fabs(double);
calculates the absolute number of a given value
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double y,x;
x = 4.2422;
y = -3284.2;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "the fabs of 4.2422 is " << fabs(x) << endl;
cout << "and the fabs of -3284.2 is " << fabs(y) << endl;
r…text/html2024-02-16T01:04:40+02:00floor
https://code-reference.com/cpp/cmath/floor?rev=1708041880&do=diff
floor
double floor(double);
rounding down a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double y,x;
x = 4.2;
y = 9.9;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "floor of " << x << " is " << floor(x) << endl;
cout << "floor of " << y << " is " << floor(y) << endl;
return 0;
}text/html2024-02-16T01:04:40+02:00fmod
https://code-reference.com/cpp/cmath/fmod?rev=1708041880&do=diff
fmod
double fmod(double, double );
returns the remainder of a statement
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double y,x;
x = 9;
y = 4.2;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "rest of " << x << " / " << y << " is " << fmod(x,y) << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00frexp
https://code-reference.com/cpp/cmath/frexp?rev=1708041879&do=diff
frexp
double frexp(double);
Mantissa m. in *n is the exponent.
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double x;
int n;
x = 42.0;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << frexp (x, &n) << " * 2^" << n << " = " << x << endl;
return 0;
}text/html2024-02-16T01:04:40+02:00HUGE_VAL
https://code-reference.com/cpp/cmath/huge_val?rev=1708041880&do=diff
#define HUGE_VAL <double rvalue>
The macro yields the value returned by some functions on a range error. The value can be a representation of infinity.text/html2024-02-16T01:04:40+02:00ldexp
https://code-reference.com/cpp/cmath/ldexp?rev=1708041880&do=diff
ldexp
double ldexp(double , int exp);
Returns x times 2 raised to n
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "4.2 raised to 2 is " << ldexp(4.2, 2) << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00log
https://code-reference.com/cpp/cmath/log?rev=1708041879&do=diff
log
double log(double);
Natural logarithm of a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double x;
x = log(1.3);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "The log is " << x << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00log10
https://code-reference.com/cpp/cmath/log10?rev=1708041879&do=diff
log10
double log10(double);
base-10 logarithm of a number
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double x;
x = log10(42000);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "The log10 of 42000 is " << x << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00modf
https://code-reference.com/cpp/cmath/modf?rev=1708041879&do=diff
modf
double modf(double , double *int);
Splits completely paid off and returns the fractional part of x.
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
double i, result;
result=modf(4.2, &i);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << i << " + " << result << " = 4.2 " << endl;
return 0;
}text/html2013-04-16T03:30:45+02:00pow
https://code-reference.com/cpp/cmath/pow?rev=1366075845&do=diff
float pow(float base, float exponent);
double pow(double base, double exponent);
double pow(double base, int exponent);
pow() returns base raised to the exp power.
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main( void )
{
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "4 raised to the 2nd power is: " << pow(4, 2) << endl;
return 0;
}text/html2024-02-16T01:04:38+02:00sin
https://code-reference.com/cpp/cmath/sin?rev=1708041878&do=diff
sin
double sin(double);
return the sinus
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main (void)
{
double x;
x = 42.0;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "sine of " << x << "° is " << sin(x*3.1415/80) << endl;;
return 0;
}text/html2024-02-16T01:04:39+02:00sinh
https://code-reference.com/cpp/cmath/sinh?rev=1708041879&do=diff
sinh
double sinh(double);
return the hyperbolic sinus
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main (void)
{
double x;
x = log(4.2);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "hyperbolic sine of " << x << " is " << sinh(x) << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00sqrt
https://code-reference.com/cpp/cmath/sqrt?rev=1708041879&do=diff
sqrt
double sqrt(double);
returns the square root
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main ( void )
{
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "square root from 4.2 is " << sqrt (4.2) << endl;
return 0;
}text/html2024-02-16T01:04:40+02:00tan
https://code-reference.com/cpp/cmath/tan?rev=1708041880&do=diff
tan
double tan(double);
Returns the tangent of a radian angle x.
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main( void )
{
double x;
x = 42;
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "tan of " << x << "° is " << tan (x*3.1415/180) << endl;
return 0;
}text/html2024-02-16T01:04:39+02:00tanh
https://code-reference.com/cpp/cmath/tanh?rev=1708041879&do=diff
tanh
double tanh(double);
Returns hyperbolic tangent of a radian angle x.
cpp Sourcecode Example
#include <iostream> /* including standard library */
#include <cmath> /* including math library */
using namespace std;
int main( void )
{
double x;
x = log(42);
//cout.setf(ios::fixed, ios::floatfield);
cout.precision(8);
cout << "hyperbolic tangent of 42 is " << tanh (x) << endl;
return 0;
}