How do I convert a double into a string in C++?
The boost ™ way: The Standard C++ way: Note: Don’t forget #include <sstream>
C++
Convert an int to ASCII character
Straightforward way: Safer way: Generic way: Handy way: C++ way: (taken from Dave18 answer) Boss way: Joe, write me an int to char converter Studboss way: char aChar = ‘6’; Joe’s way: char aChar = ‘6’; //int i = 6; Nasa’s way: //Waiting for reply from satellite… Alien’s way: ‘9’ //Greetings. God’s way: Bruh I built … Read more
C++ Singleton design pattern
In 2008 I provided a C++98 implementation of the Singleton design pattern that is lazy-evaluated, guaranteed-destruction, not-technically-thread-safe:Can any one provide me a sample of Singleton in c++? Here is an updated C++11 implementation of the Singleton design pattern that is lazy-evaluated, correctly-destroyed, and thread-safe. See this article about when to use a singleton: (not often)Singleton: … Read more
How to track down a “double free or corruption” error
When I run my (C++) program it crashes with this error. * glibc detected * ./load: double free or corruption (!prev): 0x0000000000c6ed50 *** How can I track down the error? I tried using print (std::cout) statements, without success. Could gdb make this easier?
Read file line by line using ifstream in C++
First, make an ifstream: The two standard methods are: Assume that every line consists of two numbers and read token by token: int a, b; while (infile >> a >> b) { // process pair (a,b) } Line-based parsing, using string streams: #include <sstream> #include <string> std::string line; while (std::getline(infile, line)) { std::istringstream iss(line); int … Read more
How to use _CRT_SECURE_NO_WARNINGS
Add by Configuration Properties>>C/C++>>Preporocessor>>Preprocessor Definitions>> _CRT_SECURE_NO_WARNINGS
no matching function for call to ‘ ‘
You are passing pointers (Complex*) when your function takes references (const Complex&). A reference and a pointer are entirely different things. When a function expects a reference argument, you need to pass it the object directly. The reference only means that the object is not copied. To get an object to pass to your function, … Read more
How to fix C++ error: expected unqualified-id
There should be no semicolon here: …but there should be one at the end of your class definition:
‘g++’ is not recognized as an internal or external command, operable program or batch file
Try to set g++ to your system path. You can refer to this: http://stephencoakley.com/2015/01/21/guide-setting-up-a-simple-c-development-environment-on-windows
Error: Expression must have integral or unscoped enum type
Your variable size is declared as: float size; You can’t use a floating point variable as the size of an array – it needs to be an integer value. You could cast it to convert to an integer: Your other problem is likely because you’re writing outside of the bounds of the array: Arrays are … Read more