You only set content_type when your form is valid: if comment_form.is_valid(): # … content_type = ContentType.objects.get_for_id(content_type_id) # … else: print(comment_form.errors) So when comment_form.is_valid() is false, the variable is never set. You have the same issue with object_id_data and content_data. Perhaps you need to re-think what should be returned when the form is not correct? It … Read more
Introduction Python functions are a powerful tool for writing code that can be reused and adapted for different tasks. They allow you to define a set of instructions that can be executed with a single line of code. When defining a function, you can specify the number of arguments that must be passed to the … Read more
Of course ; is expected, just like: bool isInteger(std::string input) { try { std::stoi(input); return true; } catch (…) { return false; } } 4 solved Visual Studio expected ‘;’ after a function [closed]
Technically, the arguments to functions are expressions. Expressions come in many different forms. They can be variables, like in value = fun_1(num1, num2); or they can be constants, like in value = fun_1(1, 12); or even involve operators with other expressions: value = fun_1(fun_1(42, 1) * 3, sizeof “foo”); Note that the expressions must have … Read more
This should do the work. #include <iostream> using namespace std; void chap(char,int,int); int main() { int x,z,q; char y; cout<<“do you want run program?”; cin>>x; while(x!=0) { cout<<“enter your character: \n”; cin>>y; cout<<“\nenter the number of lines: \n”; cin>>z; cout<<“enter 1 for normal pattern and enter 0 for unnormal pattern : \n”; cin>>q; chap(y,z,q); cout<<“do … Read more
This function M will count groups of a value. It outputs a list of group occurrences in this format: [index of group, length of group]. It uses a flag m to keep track of in/out of group. If it’s out, it starts a new group occurrence, if it’s in, it increments the group length. It … Read more
It could mean that the interviewer wanted to test your reaction to being confronted with invalid source code. I have no idea what the intention of Func()[] = ‘a’; is. The C++ compiler clang 3.4 outputs the following: a.cc:3:9: warning: conversion from string literal to ‘char *’ is deprecated [-Wc++11-compat-deprecated-writable-strings] return “Text”; ^ a.cc:6:1: error: … Read more
Numbers prefixed with 0 are treated as octal numbers: $x = 012;//$x is 10 Details here The reason that $x = ‘012’; works is because PHP converts that to an integer without treating it as an octal number. 0 solved Number with 0 on the front? [closed]
The problem is in foreach templated function: first parameter can be a pointer to the array or it can just be static array array with undefined size second parameter can be a function pointer or a reference to the function (which should accept constant element of same type as array elements by reference, as it … Read more
Your message functions lack a return type. C deduces it to be int. However, not returning a value from a non-void function is Undefined Behaviour. In your case, the return value from printf has probably been stored in a register, which was not overwritten by message before it itself returned. Thus, the return value propagated. … Read more
On the following line for(student_type *p; p<=&studs[1]; ++p){ You should initialize the variable p is not initialized. You should set it to a known value. I guess you’d want to initialize it as follows. Also your stop condition goes one too far: use < instead of <=. for(student_type *p=studs; p<&studs[1]; ++p){ 3 solved c++ (My … Read more
Let’s use std::vector: #include <iostream> #include <vector> #include <iomanip> typedef std::vector<double> DoubleArray; DoubleArray v_scalar_prod(double a, double *b, int n) { DoubleArray res(n); for (int i = 0; i < n; i++) { res[i] = a*b[i]; std::cout << std::setprecision(10) << “res = ” << res[i] << ‘\n’; } return res; } int main() { double y[3] … Read more
The big thing you can do is avoid running the same query twice, if you know the results haven’t changed. Chain or cache the results of your jQuery calls! Instead of: $(‘#button-active’).hide(); $(‘#button-active’).delay(30).fadeIn(1000); you can use the chainability of jQuery objects. In fact, you’re already doing it in the second line–why not take the extra … Read more
There are several ways to do this. But since the size of the array is always 6×7, you can actually create a kind of template array as an array literal, which starts with 0. Then the rest is a piece of cake: just add the argument to all the values: function snakeArray(start) { return [ … Read more
In general, returning a reference avoids that the return value gets copied, and (if it is not const-qualified) gives you the opportunity to change the “original” value. A return type const T& is often used in conjunction with objects of class type, e.g. std::vector, where copying could result in (unwanted) overhead. In conjunction with elementary … Read more