How to Fix error: expected primary-expression before ‘)’ token (C) in C++

Error: expected primary-expression before ‘)’ token occurs in C++ at a compile-time when there is a problem with the syntax of your code, specifically that a primary expression (a variable, constant, or expression that evaluates to a value) is expected before a closing parenthesis token (‘)’). Here are four solutions to fix this error: Ensure … Read more

How to Fix expression must have a constant value in C++ Length

Error expression must have a constant value in C++ length occurs when you try to use a non-constant value in a context that requires a constant expression. To fix the error in C++, use a constant size for arrays or replace the array with a dynamically sized container like std::vector. Reproducing the error int n; cin >> … Read more

List in C++ Standard Template Library (STL)

Introduction to C++ List Definition and Overview Lists are sequence containers that allow non-contiguous memory allocation. Compared to the vector, the list has slow traversal, but once a position has been found, insertion and deletion are quick (constant time). The list uses non-contiguous memory allocation, so traversal is slower than vector in C++. The list allows … Read more

What is the strlen() Function in C++

C++ strlen() function “returns the length of the given C-string. It is defined in the cstring header file.” Syntax int strlen(const char *str_var); Parameters str_var: It takes one parameter, a pointer that points to the null-terminated byte string. A null character terminates the string. If a null character does not terminate it, the behavior is … Read more

C++ Program to Implement Merge Sort

Merge sort in C++ is defined as a sorting algorithm that works by dividing an array into smaller subarrays, sorting each subarray, and then merging the sorted subarrays back together to form the final sorted array. The divide and concur have the following three tasks. Divide the problems into subproblems similar to the original but … Read more

Stack in C++ STL

C++ Stacks is a kind of container adaptor with a LIFO(Last In, First Out) type of working, where a new element is added at one end (top), and an element is removed from that end only.  Stack uses an encapsulated object of either vector or deque (by default) or list (sequential container class) as its underlying container, providing a specific set … Read more