Wednesday, August 15, 2012

Quick Mathematics


Objective-C does support C-based mathematical functions. All C are written for long variable types. Variables are declared long. Functions must be declared long float or double and any contacts must be written in floating point forms. eg. 1 should be written as 1.0.
int i; // long int
double x; // long float
fabs() – Find the absolute value or unsigned value in parentheses
results = fabs(x); // fabs(-1.5) = 1.5
ceil() – Find the ceiling integer; integer just above the value in parentheses; similar to rounding up
i = ceil(x); // ceil(2.5) = 3
floor() – find the integer that is below the floating point value in parentheses
i = floor(x); // floor(2.2) = 2
exp() – find the expoential value
pow() – raise a number to the power
result = pow(x,y); // raise x to the power of y
result = power(4,2); // raise 4 to the square = 16
sqrt() – find the square root of a number
i = sqrt(x); // sqrt(9) = 3

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