C and C++ can run on many different architectures, and machine types. Consequently, they can have different representations of numbers: Two’s complement, and Ones’ complement being the most common. In general you should not rely on a particular representation in your program. For unsigned integer types (size_t being one of those), the C standard (and the … Read more
This question attempts to collect the few pearls among the dozens of bad C++ books that are published every year. Unlike many other programming languages, which are often picked up on the go from tutorials found on the Internet, few are able to quickly pick up C++ without studying a well-written C++ book. It is … Read more
I thought this would be really simple, but it’s presenting some difficulties. If I have How do I combine them to get a single string “John21”?
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: How … Read more
If you’re using glibc, you can set the MALLOC_CHECK_ environment variable to 2, this will cause glibc to use an error tolerant version of malloc, which will cause your program to abort at the point where the double free is done. You can set this from gdb by using the set environment MALLOC_CHECK_ 2 command before running your program; the program … Read more
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 a, b; if … Read more
It may have been because I am still new to VS and definitely new to C, but the only thing that allowed me to build was adding At the top of my file, this suppressed the C4996 error I was getting with sprintf A bit annoying but perfect for my tiny bit of code and … Read more
You are trying to call DeckOfCards::shuffle with a deckOfCards parameter: But the method takes a vector<Card>&: The compiler error messages are quite clear on this. I’ll paraphrase the compiler as it talks to you. Error: Paraphrased: Hey, pal. You’re trying to call a function called shuffle which apparently takes a single parameter of type reference-to-deckOfCards, but there is no such function. Error: … Read more
Your consideration is wrong. The value of r does not change, since it is given as value to the Quicksort function(not a reference). You handle the ranges with p,q such that p is the first index in the range and q the first index not in the range. Thus, your calls were wrong: Here is the complete example. I used std::swap to change elements and ans std::vector … Read more
As stated by @user657267 get rid of the semicolons when declaring a function and its implementation. If you were to have above the main and the implementation of that function below the main That would be ok. The implementation can also go above the main and then you don’t have to write the first line … Read more