Programming

Online C++ Compiler

Use the online C++ compiler to practice STL containers, loops, functions and competitive-programming style console programs. The default example uses vector and accumulate so beginners can see modern C++ patterns quickly. Compilation runs through an isolated provider when available, and the page keeps code, input, output, errors, examples and related compilers in one focused layout.

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Online compiler

C++ workspace

File: anku-cpp-example.cppSandbox run

C++ editor

File: anku-cpp-example.cpp

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Standard input

Output

Success

Ready.

Values: 3 5 8 13
Total: 29
C++ execution requires a configured sandbox API.

How to use this C++ compiler

  • Open the C++ starter code or choose another example from the dropdown.
  • Add stdin only if the example reads from standard input.
  • Review stdout, errors, compile output or table results in the output panel.
  • Copy the code or download it as a .cpp file when the result looks right.

C++ features

  • Modern STL starter code
  • Compile and runtime panels
  • Download .cpp files
  • Examples for vector and input
  • Related C, Java and Python links
  • Sandbox provider boundary

Common use cases

  • Practice STL basics
  • Prepare algorithm exercises
  • Compare C and C++ syntax
  • Debug one-file programs

C++ example code

Use vector and numeric algorithms.

#include <iostream>
#include <numeric>
#include <vector>

int main() {
  std::vector<int> values {3, 5, 8, 13};
  int total = std::accumulate(values.begin(), values.end(), 0);

  std::cout << "Values:";
  for (int value : values) {
    std::cout << " " << value;
  }
  std::cout << "\nTotal: " << total << "\n";
  return 0;
}

Sample output

Values: 3 5 8 13
Total: 29

Common C++ errors

  • Missing namespace: Use std:: prefixes or add using declarations intentionally.
  • Template error noise: Look near the first reported error; later STL messages are often consequences.
  • Input not read: Provide stdin values when using cin.

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Frequently Asked Questions

Can I run C++ code online here?

Yes, when a sandbox provider is configured. C++ compilation should run in an isolated execution layer.

Does the compiler support STL?

The examples are written for standard one-file C++ with common STL headers such as vector, algorithm and numeric.

How do I provide cin input?

Add the values in the stdin panel before running the code.

Why are C++ errors so long?

Template-heavy code can produce verbose messages. Start from the first error and check nearby syntax first.

Can I save the file locally?

Yes. The download button saves the current editor content as a .cpp file.