iOS objective-C: using modulo on a float to get “inches” from Feet

问题

I am trying to make a simple objective-C height converter. The input is a (float) variable of feet, and I want to convert to (int) feet and (float) inches:

float totalHeight = 5.122222;
float myFeet = (int) totalHeight; //returns 5 feet
float myInches = (totalHeight % 12)*12; //should return 0.1222ft, which becomes 1.46in

However, I keep getting an error from xcode, and I realized that the modulo operator only works with (int) and (long). Can someone please recommend an alternative method? Thanks!

回答1:

Even modulo works for float, use :

fmod()

You can use this way too...

float totalHeight = 5.122222;
float myFeet = (int) totalHeight; //returns 5 feet
float myInches = fmodf(totalHeight, myFeet);
NSLog(@"%f",myInches);

回答2:

Why don't you use

CGFloat myInches = totalHeight - myFeet;

回答3:

As answered earlier, subtracting is the way to go. Just remember to convert the one tenths of feet to inches by multiplying with 12:

float totalHeight = 5.122222;
int myFeet = (int) totalHeight;
float myInches = (totalHeight - myFeet) * 12;

来源：https://stackoverflow.com/questions/16394216/ios-objective-c-using-modulo-on-a-float-to-get-inches-from-feet