Get Whole number part of a float :Objective-C

Question

So i have

float x = x + 0.25;

This float will be called every time a click happens

NSLog(@"%f",x);

I want the nslog to only return the whole number portion so like this

  x        return        

---

 1.25         1
 1.50         1
 3.25         3
 4.75         4

Any ideas?

Answer 1

Converting to int won't work if the floating-point number is outside the range of int.

Printing with "%.0f" doesn't truncate, it rounds, so 4.75 will print as 5.

If your compiler (more accurately, your runtime library) supports them, the trunc(), truncf(), and truncl() functions, declared in <math.h>, do exactly what you want:

printf("%.0f\n", trunc(x));

Those functions are new in C99, so it's possible your compiler doesn't support them. C90 does provide a floor() function; you can use that if you write some special-case code for negative numbers.

Answer 2

You can treat x as an int (cast):

NSLog("%d", (int)x);

Note: this will not round, it will truncate the value, returning only the integer part.

EDIT: please note that this is not a safe way to truncate all possible float values, it will work fine for small values though (those fitting in an int).