CMD Simulator

Double-Free - Invalid free()

Call free() twice on the same pointer. MemC detects and explains the double-free error.

Try an example:
Your C code (must have main())
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Click Run or Step to execute your code. The diagram will show where variables live: Stack (local vars), Heap (malloc blocks), and pointers between them.

Output (printf)

No output yet. Use printf("text") or printf("x = %d", x) to print.