input

istream and ostream problem – C++

Make sure you include fstream. Also, put “std::” before ostream or put “using namespace std” somewhere. It would help if you posted the code, as right now I’m just guessing based on common mistakes. I would guess you forgot to include fstream because different compilers may use different header files and it may be the … Read more

input() error – NameError: name ‘…’ is not defined

TL;DR input function in Python 2.7, evaluates whatever your enter, as a Python expression. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings. If you are using Python 3.x, raw_input has been renamed to input. Quoting the Python 3.0 release notes, raw_input() was renamed to input(). That is, the new input() function reads a … Read more

Is there a float input type in HTML5?

The number type has a step value controlling which numbers are valid (along with max and min), which defaults to 1. This value is also used by implementations for the stepper buttons (i.e. pressing up increases by step). Simply change this value to whatever is appropriate. For money, two decimal places are probably expected: (I’d also set min=0 if it can only be positive) If you’d … Read more

Mask for an Input to allow phone numbers?

Angular5 and 6: angular 5 and 6 recommended way is to use @HostBindings and @HostListeners instead of the host property remove host and add @HostListener Working Online stackblitz Link: https://angular6-phone-mask.stackblitz.io Stackblitz Code example: https://stackblitz.com/edit/angular6-phone-mask Official documentation link https://angular.io/guide/attribute-directives#respond-to-user-initiated-events Angular2 and 4: Plunker >= RC.5 original One way you could do it is using a directive that injects NgControl and manipulates the … Read more

Multiple inputs on one line

Yes, you can input multiple items from cin, using exactly the syntax you describe. The result is essentially identical to: This is due to a technique called “operator chaining”. Each call to operator>>(istream&, T) (where T is some arbitrary type) returns a reference to its first argument. So cin >> a returns cin, which can … Read more

Using cin to input a single letter into a char

You are not inputting or outputting the characters correctly. char letter[2] is an array of 2 characters, not a single character. You want char letter. Further, you are outputting letter[2], which is the third element of an array that only has two values (indexing in C++ starts from 0; the first element is letter[0] and … Read more

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