C++ Online Compiler — Free Cloud IDE, C++20 Runner & Visualizer
Modern C++ Online Compiler & Memory Visualizer (GCC 9.2 / C++20)
ZenCompiler delivers an ultra-fast modern C++ online compiler powered by GCC 9.2. Write, compile, and execute C++ programs with Standard Template Library (STL) containers (std::vector, std::map, std::unordered_set, std::priority_queue), 2D vectors, nested map of maps, smart pointers (std::unique_ptr, std::shared_ptr), pointer of pointer structures, operator overloading, lambda expressions, and RAII resource management in an interactive cloud IDE.
Core C++ Compiler Features
- Comprehensive C++ Standard Template Library (STL) support with vectors, queues, deques, sets, and priority_queue
- Modern C++17/C++20 language features including auto deduction, structured bindings, operator overloading, and lambdas
- Support for 2D vectors (vector<vector<int>>) and nested associative containers (map<string, map<string, int>>)
- Step-by-step memory visualizer for tracking pointer references, object lifecycles, and stack frames
- Interactive STDIN terminal for fast competitive programming inputs (std::cin, std::getline)
Linux Container Sandboxing & Toolchain
Compiled with g++ -O2 -std=c++17 -Wall inside secure Linux container workers with direct standard library linkage and instantaneous compilation feedback.
Supported Use Cases
Competitive programming (LeetCode, Codeforces, HackerRank), algorithm design (BFS/DFS, Dijkstra with priority_queue), data structures coursework (trees, graphs, heaps), and high-performance software modeling.
Frequently Asked Questions
How do I run C++ code online in ZenCompiler?
Simply type or paste your C++ code into the editor, provide any optional inputs in the STDIN tab, and click the "Run" button (or press Ctrl/Cmd + Enter). Your code is executed inside a secure cloud Linux container with output streaming directly to the terminal.
Can I use ZenCompiler as an online c++ compiler for mobile?
Yes! ZenCompiler is fully optimized as a mobile compiler online. You can code, edit, and run C++ on any mobile smartphone, iPhone, Android device, or tablet with responsive touch controls, virtual keyboard shortcuts, and full terminal input support without downloading any apps.
Which C++ compiler or runtime version is used?
ZenCompiler executes code using C++ (GCC 9.2.0), ensuring modern language standards, optimizations, and standard library support.
How do I use STL containers like vector, map, and priority_queue in C++?
Simply include the corresponding headers (#include <vector>, #include <map>, #include <queue>). ZenCompiler links all standard C++ libraries automatically.
Does ZenCompiler support C++ operator overloading and custom copy semantics?
Yes. You can overload arithmetic, comparison, stream insertion (operator<<), and assignment operators within classes and structs.
Can I use fast I/O and interactive std::cin in this C++ online compiler?
Yes. You can use standard std::cin operations alongside std::ios_base::sync_with_stdio(false); cin.tie(NULL); for competitive programming. Provide test cases in the STDIN input box or use the live terminal.
Does ZenCompiler support C++ memory visualization for pointers and trees?
Yes. Click Visualize to watch tree nodes, linked list pointers, array indices, and call stack recursions update step-by-step during execution.
