C++ Code to Flowchart Converter

Paste a C++ program and get a clear flowchart of what it does. cin becomes an input box and cout an output box, loops get a condition and a loop-back arrow, and every if / else is a decision with labelled branches. Then press ▶ Explain to step through it with the variables updating.

  • cin and cout as input/output boxes
  • for, while and do-while loops with loop-back arrows
  • if / else and switch as decisions
  • Skips #include, using namespace and int main() boilerplate
  • Animated dry run with a variable trace table
  • Export PNG, PDF, PowerPoint, SVG or Mermaid

How it works

  1. Paste your C++ code and a sample input
  2. The AI draws the flowchart
  3. Press ▶ Explain to watch it run
  4. Export or copy the trace table

Try it with

  • int n, a = 0, b = 1, next; cin >> n; cout << a << " " << b << " "; for (int i = 3; i <= n; i++) { next = a + b; cout << next << " "; a = b; b = next; }
  • int n, rev = 0; cin >> n; while (n != 0) { rev = rev * 10 + n % 10; n /= 10; } cout << "Reversed: " << rev;
  • int n; bool prime = true; cin >> n; for (int i = 2; i * i <= n; i++) if (n % i == 0) { prime = false; break; } cout << (prime && n > 1 ? "Prime" : "Not prime");

Frequently asked questions

Is it free?

Yes. Drawing by hand is always free and every account includes free AI credits. AI Flowchart Pro adds unlimited AI generation and every diagram type.

Does it support classes and STL?

For short programs, yes: method calls and STL operations (push_back, sort) become process steps. The flowchart focuses on the control flow of main() and the functions it calls.

How is break shown?

As an arrow that leaves the loop straight from the step where it happens, so you can see exactly where the loop ends early.

Does it run my code?

No. Nothing is compiled or executed; the AI reads the code and works out the dry run.

Can I export it?

Yes — PNG, SVG, PDF, PowerPoint with an editable slide, Mermaid code and draw.io. You can also share a live link or present it full screen.

Ready-made examples, explained

All diagram templates →

Related tools

Try AI Flowchart free →