Divide int's and round up in Objective-C

I have 2 int's. How do I divide one by the other and then round up afterwards?

Solution 1:

If your ints are A and B and you want to have ceil(A/B) just calculate (A+B-1)/B.

Solution 2:

What about:

float A,B; // this variables have to be floats!
int result = floor(A/B); // rounded down
int result = ceil(A/B); // rounded up

Solution 3:

-(NSInteger)divideAndRoundUp:(NSInteger)a with:(NSInteger)b
{
  if( a % b != 0 )
  {
    return a / b + 1;
  }
  return a / b;
}

Solution 4:

As in C, you can cast both to float and then round the result using a rounding function that takes a float as input.

int a = 1;
int b = 2;

float result = (float)a / (float)b;

int rounded = (int)(result+0.5f);
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