Math Functions

• Most complex math functions are part of a library.
• #include <cmath>
• Most come in several "flavors"
• absolute value
  • int abs(int)
  • Takes an int as a parameter
  • Returns an integer result
  • long abs(long)
  • Same, but with a long.
  • float fabs(float)
  • This one actually is multiple functions, it returns the floating point type it takes
  • long double fabs(long double)
• Power functions
  • float pow(float, float)
  • pow(2,10) computes 2¹⁰
  • For the entire float family
  • float sqrt(float)
  • For the entire float family.
• Trig functions
  • sin, cos, tan
  • acos, atan, atan2, ...
  • All are float, double, long double
  • Work in radians, not degrees
• This is just a taste, most functions are available.
• Math Constants
  • There are a number of predefined math constants as well.
    • look at (with your editor) /usr/include/math.h
    • M_PI and various values
    • M_E and associated log values
    • M_SQRT2, the square root of 2.
  • Look at /usr/include/limits.h
    • This gives you size limits for most numeric types.