When creating an array like that, its size must be constant. If you want a dynamically sized array, you need to allocate memory for it on the heap and you’ll also need to free it with delete when you’re done: If you want a fixed size, then they must be declared const: Also, doesn’t even provide a … Read more
Notice you’re not dynamically allocating the variable, which pretty much means the data inside str, in your function, will be lost by the end of the function. You should have: Then, when you call the function, the type of the variable that will receive the data must match that of the function return. So, you should … Read more
You can use Array.filter function to filter out elements of an array based on the return value of a callback function. The callback function runs for every element of the original array. The logic for the callback function here is that if the indexOf value for current item is same as the index, it means the element has been … Read more
If you don’t want to change the strings, then you could simply do When you do it like this you will allocate an array of two pointers to const char. These pointers will then be set to the addresses of the static strings “blah” and “hmm”. If you do want to be able to change the actual string content, … Read more
How should I declare main() method in Java? String[] and String… are the same thing internally, i. e., an array of Strings. The difference is that when you use a varargs parameter (String…) you can call the method like: And when you declare the parameter as a String array you MUST call this way: What’s actually the difference between String[] and String… if … Read more
Array in C++ must have a size defined at compile-time. If you want variable length array, use std::vector instead. In your case, I would use template for Matrix Size and have different implementation for different matrix size (unless I misunderstood your intentions). Since I did not defined the generic template, using any other value than 2 or … Read more
delete will delete the object property, but will not reindex the array or update its length. This makes it appears as if it is undefined: Note that it is not in fact set to the value undefined, rather the property is removed from the array, making it appear undefined. The Chrome dev tools make this distinction clear by printing empty when … Read more
As the other answer by horseshoe correctly suggests, you will have to use a loop to calculate variance otherwise the statement var = ((Array[n] – mean) * (Array[n] – mean)) / numPoints; will just consider a single element from the array. Just improved horseshoe’s suggested code: Your sum works fine even without using loop because … Read more
Have you thought about using Python list’s .index(value) method? It return the index in the list of where the first instance of the value passed in is found.
This will do