Find the percentage that is one integer to another

Question

I have two integers (amount of bytes of two files). One is always smaller if not the same than the other. I want to calculate the percentage that the smaller is of the bigger.

I'm using plain C. I've applied the math formula, but am getting always 0:

printf("%d\r", (current/total)*100);

Any ideas?

Answer 1

Try

printf("%g\r", (((double)current)/total)*100);

instead. Integer division always rounds towards zero. By converting one of the numbers to double first, you will trigger floating point division. If you would like to use integer arithmetic, you could also use

printf("%d\r", (100*current)/total);

which will print the percentage rounded down to the next integer.