Index
C++ Math
C++ has many functions that allows you to perform mathematical tasks on numbers.
Max and min
The max(x,y) function can be used to find the highest value of x and y:
Example:
#include <iostream>
using namespace std;
int main() {
cout << max(1, 5);
return 0;
}
Output:
5
And the min(x,y) function can be used to find the lowest value of x and y:
Example:
#include <iostream>
using namespace std;
int main() {
cout << min(5, 10);
return 0;
}
Output:
5
C++ <cmath> Header
Other functions, such as sqrt (square root), round (rounds a number) and log (natural logarithm), can be found in the <cmath> header file:
Example:
#include <iostream>
#include <cmath>
using namespace std;
int main() {
cout << sqrt(81) << "\n";
cout << round(3.6) << "\n";
cout << log(2) << "\n";
return 0;
}
Output:
9
4
0.693147
Other Math Functions
A list of other popular Math functions (from the <cmath> library) can be found in the table below:
| Function | Description |
|---|---|
| abs(x) | Returns the absolute value of x |
| acos(x) | Returns the arccosine of x |
| asin(x) | Returns the arcsine of x |
| atan(x) | Returns the arctangent of x |
| cbrt(x) | Returns the cube root of x |
| ceil(x) | Returns the value of x rounded up to its nearest integer |
| cos(x) | Returns the cosine of x |
| cosh(x) | Returns the hyperbolic cosine of x |
| exp(x) | Returns the value of Ex |
| expm1(x) | Returns ex -1 |
| fabs(x) | Returns the absolute value of a floating x |
| fdim(x, y) | Returns the positive difference between x and y |
| floor(x) | Returns the value of x rounded down to its nearest integer |
| hypot(x, y) | Returns sqrt(x2 +y2) without intermediate overflow or underflow |
| fma(x, y, z) | Returns x*y+z without losing precision |
| fmax(x, y) | Returns the highest value of a floating x and y |
| fmin(x, y) | Returns the lowest value of a floating x and y |
| fmod(x, y) | Returns the floating point remainder of x/y |
| pow(x, y) | Returns the value of x to the power of y |
| sin(x) | Returns the sine of x (x is in radians) |
| sinh(x) | Returns the hyperbolic sine of a double value |
| tan(x) | Returns the tangent of an angle |
| tanh(x) | Returns the hyperbolic tangent of a double value |
