Objective-C common functions and constants

Arithmetic functions

Arithmetic functions]

Function Name	Description
Int rand ()	Random Number Generation. (Example) Srand (Time (NiL); // initial Random Number Int val = rand () % 50; // 0 ~ Random Number between 49
Int ABS (int)	Absolute value of an integer (Example) int val = ABS (-8 ); → 8 ※Fabs is used for Floating Point.
Double FABS (double)	Absolute Value of a floating point (Example) Double val = FABS (-12.345 ); → 12.345 ※Abs is used for integers.
Double floor (double)	Returns the integer part of the floating point number (discard the decimal point) (Example) Double val = floor (12.345 ); → 12.000
Double Ceil (double );	Return the integer part of the floating point number (discard the decimal part and enter 1 in the single digit) (Example) Double val = Ceil (12.345 ); → 13.000
Double POW (double A, double B)	B power of (Example) Double val = POW (2, 3 ); → 8
Double SQRT (double)	Square root of (Example) Double val = SQRT (2 ); → 1.41421356

Trigonometric function

Trigonometric function]

Function Name	Description
Double cos (double)	Cosine Function (A: radian)
Double sin (double)	Sine function (A: radian)
Double Tan (double)	Tangent function (A: radian)
Double asin (double)	Arcsin (A: radian)
Double ACOs (double)	Arccosine function (A: radian)
Double atan (double)	Arctangent Function
Double atan2 (double A, double B)	Returns the arc tangent of the given coordinate values A and B.

Exponential functions

[Exponential function]

Function Name	Description
Double Log (double)	Base on E
Double log10 (double)	Log of the logarithm function

Constant

Constant

Constant name	Description
M_pi	Circumference rate (= π)
M_pi_2	1/2 of the circumference rate (= π/2)
M_pi_4	1/4 of the circumference rate (= π/4)
M_1_pi	= 1/π
M_2_pi	= 2/π
M_e	= E
M_log2e	Log_2 (E)
M_log10e	Log_10 (E)