At worst, your lecturer is wrong. At best, he was simplifying terminology, and confusing you in the process. This is reasonably commonplace in software education, unfortunately. The truth is, many books get this wrong as well; the array is not “passed” at all, either “by pointer” or “by reference”. In fact, because arrays cannot be passed by … Read more
First of all, you use the data type int, which cannot hold fractional values (and will implicitly round them towards zero, even before the function is ever called.) You should use double instead, since this is the proper datatype for fractional numbers. You would also want to use the ceil(x) function, which gives the nearest whole number larger than or … Read more
The $ allows you extract elements by name from a named list. For example You can find the names of a list using names() This is a basic extraction operator. You can view the corresponding help page by typing ?Extract in R.
f2 is taking it’s arguments by reference, which is essentially an alias for the arguments you pass. The difference between pointer and reference is that a reference cannot be NULL. With the f you need to pass the address (using & operator) of the parameters you’re passing to the pointer, where when you pass by reference you just pass the parameters and … Read more
The following program calculates nCr in an efficient manner (compared to calculating factorials etc.) As of Python 3.8, binomial coefficients are available in the standard library as math.comb:
Your code as it stands is correct but I am having a hard time figuring out how it could/would be used in a real world scenario. With that said, please be aware of a few caveats when returning pointers from functions: When you create an array with syntax int arr[5];, it’s allocated on the stack … Read more
You can get the coordinate of the target element and set the scroll position to it. But this is so complicated. Here is a lazier way to do that: This uses replaceState to manipulate the url. If you also want support for IE, then you will have to do it the complicated way: Demo: http://jsfiddle.net/DerekL/rEpPA/Another … Read more
It’s not obvious what you’re trying to accomplish here, but I’ll assume you’re trying to do some pointer arithmetic with x, and would like x to be an integer for this arithmetic but a void pointer on return. Without getting into why this does or doesn’t make sense, you can eliminate the warning by explicitly … Read more
How about this? P.S. You should place hello() above of the button.
How about this? P.S. You should place hello() above of the button.