C++ Math – Your Fav Topic

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C++ Math Functions Examples


#include <cmath>

You can copy this code below. In most of these examples, we encourage users to copy the code below.

// Math your fav topic
#include <iostream>
#include <cmath>

using namespace std;

int main(){
    cout << "sqrt(144) = " << sqrt(144) << endl;
    cout << "round(2.65) = " << round(2.65) << endl;
    cout << "log(3) =" << log(3) << endl;      
}


What C++ Library do we need for special maths ?

Line 3 : Don’t forget to include that <cmath> library


Image of source  c++ sample source code for math functions


List of Other Popular C++ Math Functions

FunctionDescription
abs(x)Returns the absolute value of x
acos(x)Returns the arccosine of x, in radians
asin(x)Returns the arcsine of x, in radians
atan(x)Returns the arctangent of x, in radians
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, in radians
cosh(x)Returns the hyperbolic cosine of x, in radians
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


Homework — Stuff your math teacher would love

  • 1) Once again, memorize this short code
  • 2) Rewrite the code above into your c++ compiler/editor from memory
  • 3) Change the types of functions being calculated to 3 of those in the list above
  • 4) Double check results with your calculator

Next Lesson 9, C++ Pointers and References

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