Division with expected result between 1 and 0 always gives 0 [duplicate]

Question

Possible Duplicate:
What is the behavior of integer division in C?

When I do a division calculation with an answer that's supposed to be between 1 and 0, it always returns 0.

Try this:

float a = 1;
float b = 2;
float c = a / b; //variable divide by variable gives 0.5 as it should
float d = 1 / 2; //number divide by number gives 0
float e = 4 / 2;
NSLog(@"%f %f %f %f %f", a,b,c, d, e);

I get this from the console:

2013-01-17 14:24:17.512 MyProject[1798:c07] 1.000000 2.000000 0.500000 0.000000 0.500000

I have no idea what is going on.

Answer 1

You're dividing integer with integer. The result will be an integer, the remainder is omitted:

1 / 2 = 0     The remainder (0.5) is omitted.

Only after the division is done, your result is passed into your float d variable.

EDIT: Right, I forgot to suggest a solution: Make sure at least one of your operands is a float.

1.0 / 2 = 0.5    

1 / 2.0 = 0.5