Division in C++

Question

Such as dividing two numbers where the dividend is less than the quotient.

For example, I need to calculate the points a student has earned by attendance. 28 appearances result in 2 points, but if it is less than 28, i need to divide the 2 by 28 to know how many points are gained by presence.
In this case the solution I found was to create a constant already with the value of the division, since whenever I try to divide 2 by 28 (2/28) in C++ the result is 0.
in this case the solution I found was to creat.

Answer 1

Was your question cropped by character limits? in last paragraph => "in this case the solution I found was to creat.". I don't know if this may help, but have you tried using float or double to store the division result?

Answer 2

lpang is almost certainly right.

In C or C++, if you divide two integers in the standard way, the remainder will be thrown away, so you're left with the quotient.

e.g.
int a = 12;
int b = 5;
int result = a / b;

In this case, 'result' will equal 2 and not 2.4, because result is an integer variable, so can't store real numbers like 2.4

If you had the code:

int a = 12;
int b = 5;
// Thanks to Gordie for the correction to my code
// Reminding us the importance of code reviews!
double result = (double)a / b;

The 'result' will be 2.4.

2 divided by 28, gives 0 remainder 2 in integer division. As the remainder is usually thrown away in C or C++, your result is therefore zero!

Just try what lpang suggested and use a double to store the result.

Something like:
const double presence_constant = 2 / 28;

I'm not trying to steal the best answer from lpang though. I graciously ask you to give lpang 'best answer'. I merely expanded on their wisdom.

Answer 3

@correalinux, Could you post the code link here? maybe if our friends here can see the code things could get clearer, oh also try suggestion by Gordie and Xan : )

Answer 4

Ipang Yes, the question was cut. I was saying that the solution was to put the value in a constant rather than calculate and play on a variable.

And yes, too. I have already tried using both Float and Double, both resulting in 0.

Answer 5

Thanks Gordie! Well spotted. This is why code reviews are so important.

Answer 6

Don't give me best answer...

I'm appreciating the wisdom of everyone else today.

Team work :-)

Answer 7

Thank you guys.

It was just the point. I did not know this case, but finally living and learning, I put a ".0" there, and problem solved 😀

Answer 8

Hurray! This was a great team effort. SoloLearn has a great community!

Answer 9

Xan ... True, I'm really enjoying the platform, active community and lots of interaction. This is excellent.

Answer 10

Yes, it's the best online programming community ever! :-)