Getting float value from integers

Question

How can I get a float or real value from integer division? For example:

double result = 30/233;

yields zero. I'd like the value with decimal places.

How can I then format so only two decimal places display when used with a string?

Answer 1

You could just add a decimal to either the numerator or the denominator:

double result = 30.0 / 233;
double result = 30 / 233.0;

Typecasting either of the two numbers also works.

As for the second part of the question, if you use printf-style format strings, you can do something like this:

sprintf(str, "result = %.2f", result);

Bascially, the ".2" represents how many digits to output after the decimal point.

Answer 2

If you have an integer (not integer constant):

int i = 20;
int j = 220;
double d = i/(double)j;