+ 1

Division in C++

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.

2nd Apr 2018, 9:55 AM
Lucas De M. CorrĂȘa
Lucas De M. CorrĂȘa - avatar
10 Respostas
+ 6
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?
2nd Apr 2018, 10:07 AM
Ipang
+ 3
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.
2nd Apr 2018, 10:24 AM
Emma
+ 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 : )
2nd Apr 2018, 10:41 AM
Ipang
+ 2
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.
2nd Apr 2018, 10:35 AM
Lucas De M. CorrĂȘa
Lucas De M. CorrĂȘa - avatar
+ 2
Thanks Gordie! Well spotted. This is why code reviews are so important.
2nd Apr 2018, 10:35 AM
Emma
+ 2
Don't give me best answer... I'm appreciating the wisdom of everyone else today. Team work :-)
2nd Apr 2018, 10:38 AM
Emma
+ 2
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 😀
2nd Apr 2018, 10:42 AM
Lucas De M. CorrĂȘa
Lucas De M. CorrĂȘa - avatar
+ 1
Hurray! This was a great team effort. SoloLearn has a great community!
2nd Apr 2018, 10:47 AM
Emma
+ 1
Xan ... True, I'm really enjoying the platform, active community and lots of interaction. This is excellent.
2nd Apr 2018, 10:52 AM
Lucas De M. CorrĂȘa
Lucas De M. CorrĂȘa - avatar
0
Yes, it's the best online programming community ever! :-)
2nd Apr 2018, 11:00 AM
Emma