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Convert to absolute value in Objective-C
As i am playing with 2d graphics, i'd like to calculate amount of points object has moved between 2 CGPoints. Given that object can move in both direction, i am only interested in sheer number of points representing the difference.
In Java i'd Math.abs(startpoint.x - endpoint.x)
How can i do the same in Objective-C?
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In C programming language the use of the function abs in C is to return the absolute value of an integer. By integer, it means that the abs() is an arithmetics function. The stdlib. h library contains predefined function abs() for computing the absolute value of integers.
The Math. abs() function returns the absolute value of a number. That is, it returns x if x is positive or zero, and the negation of x if x is negative.
abs() method returns the absolute (Positive) value of a int value. This method gives the absolute value of the argument. The argument can be int, double, long and float.
The abs () function is a predefined function in the stdlib. h header file to return the absolute value of the given integers.
There are C functions from <math.h> that will do what you want:
abs(int val); labs(long val); llabs(long long val); fabs(double val); fabsf(float val); fabsl(long double val): Given that CGPoint structures are composed of CGFloats, you should use fabsf here.
Check out the Wikipedia page
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