C/C++ Online Editor

The C++ WebAssembly environment supports:

• Basic C++ classes with encapsulation and inheritance
• Member functions and constructors
• References and basic polymorphism
• Templates for simple functions
• Traditional C features (structs, pointers)
• Basic memory management

Example of supported code:

#include <stdio.h>

class Person {
private:
    char name[100];
    int age;

public:
    Person(const char* n, int a) {
        strcpy(name, n);
        age = a;
    }

    void display() {
        printf("Name: %s, Age: %d\n", name, age);
    }
};

The following features may cause compilation errors or runtime issues:

• Standard Template Library (STL) containers (vector, map)
• Complex I/O streams (iostream, stringstream)
• Exception handling (try/catch)
• RTTI (Run-Time Type Information)
• Multiple inheritance
• Lambda expressions
• Threading and synchronization
• File I/O operations

This error typically occurs when:

1. Using unsupported C++ features or libraries
2. Improper memory management causing segmentation faults
3. Stack overflow from large recursive calls
4. Using unimplemented library functions

Try using this more reliable approach:

#include <stdio.h>
#include <stdlib.h>

struct Person {
    char name[100];
    int age;
};

void displayPerson(struct Person* p) {
    printf("Name: %s, Age: %d\n", p->name, p->age);
}

int main() {
    struct Person person = {"John", 30};
    displayPerson(&person);
    return 0;
}

For maximum compatibility:

1. Use C-style functions instead of C++ streams
2. If using C++ features, prefer explicit namespaces

// Instead of this (may not work):
#include <iostream>
using namespace std;
cout << "Hello" << endl;

// Use this (more reliable):
#include <stdio.h>
printf("Hello\n");

Best practices for memory management:

1. Prefer stack allocation when possible
2. Keep track of all memory allocations
3. Match each new/malloc with delete/free
4. Avoid complex memory patterns

Example of proper memory management:

#include <stdlib.h>
#include <stdio.h>

int main() {
    // Stack allocation (safer)
    int numbers[5] = {1, 2, 3, 4, 5};

    // Dynamic allocation (needs careful management)
    int* data = (int*)malloc(5 * sizeof(int));
    if (data) {
        for (int i = 0; i < 5; i++) {
            data[i] = i * 10;
        }
        // Always free allocated memory
        free(data);
    }
    return 0;
}

If your code doesn't compile or run:

1. Start with a minimal example
2. Try using C alternatives to C++ features (printf vs cout)
3. Check that all necessary headers are included
4. Look for syntax differences between C and C++
5. Try refreshing the page if you get random errors

Debugging approach:

#include <stdio.h>

int main() {
    // Add print statements to trace execution
    printf("Starting program\n");

    int x = 10;
    printf("x = %d\n", x);

    // Check intermediate results
    int result = x * 5;
    printf("result = %d\n", result);

    return 0;
}

Explore these official resources and learning materials:

Official Documentation:

• ISO C++ Standard - Official C++ standardization committee
• C++ Reference - Comprehensive C++ documentation
• C++ Core Guidelines - Modern C++ best practices
• GCC Documentation - GNU Compiler Collection docs

Learning Resources:

• Learn C++ - Comprehensive free C++ tutorial
• Google C++ Style Guide - Industry coding standards
• C++ Best Practices - Community guidelines
• Modern C++ Features - C++11/14/17/20 features

Advanced Topics:

• Effective C++ - Scott Meyers' essential books
• C++ Patterns - Design patterns in C++
• Boost Libraries - Peer-reviewed C++ libraries
• CppCon Talks - Conference presentations

These resources cover C++ from fundamentals to advanced system programming!