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What does the f after the numbers indicate? Is this from C or Objective-C? Is there any difference in not adding this to a constant number?
CGRect frame = CGRectMake(0.0f, 0.0f, 320.0f, 50.0f); Can you explain why I wouldn't just write:
CGRect frame = CGRectMake(0, 0, 320, 50); 
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When representing a float data type in Java, we should append the letter f to the end of the data type; otherwise it will save as double. The default value of a float in Java is 0.0f. Float data type is used when you want to save memory and when calculations don't require more than 6 or 7 digits of precision.
The f suffix simply tells the compiler which is a float and which is a double .
'%f': Print a floating-point number in normal (fixed-point) notation. See Floating-Point Conversions, for details.
5 is of type integer where as 5f is of type float. Positions tend to use floats and doubles, since you need precision.
CGRect frame = CGRectMake(0.0f, 0.0f, 320.0f, 50.0f); uses float constants. (The constant 0.0 usually declares a double in Objective-C; putting an f on the end - 0.0f - declares the constant as a (32-bit) float.)
CGRect frame = CGRectMake(0, 0, 320, 50); uses ints which will be automatically converted to floats.
In this case, there's no (practical) difference between the two.
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