How to get fractions in an integer division?

Question

How do you divide two integers and get a double or float answer in C?

Answer 1

You need to cast one or the other to a float or double.

int x = 1; int y = 3;  // Before x / y; // (0!)  // After ((double)x) / y; // (0.33333...) x / ((double)y); // (0.33333...) 

Of course, make sure that you are store the result of the division in a double or float! It doesn't do you any good if you store the result in another int.

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Regarding @Chad's comment ("[tailsPerField setIntValue:tailsPer]"):

Don't pass a double or float to setIntValue when you have setDoubleValue, etc. available. That's probably the same issue as I mentioned in the comment, where you aren't using an explicit cast, and you're getting an invalid value because a double is being read as an int.

For example, on my system, the file:

#include <stdio.h> int main() {     double x = 3.14;     printf("%d", x);     return 0; } 

outputs:

1374389535

because the double was attempted to be read as an int.

Answer 2

Use type-casting. For example,

main()     {         float a;         int b = 2, c = 3;         a = (float) b / (float) c;     // This is type-casting         printf("%f", a);     }