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The LeetCode for VLSI.

Zoi Sandbox for free-form simulation, Zoi Practice for curated units, Zoi Code for graded challenges, and Zoi3D for 3D interactive hardware.

Zoi SandboxBuild and simulate Verilog modules in a free-form playground.Zoi PracticeSolve curated problems and test your code against hidden cases.Zoi CodeComplete graded challenges and get results from our automated judge.Zoi3D WorkbenchVisualize Clock Domain Crossing, Async FIFOs, and UART on a 3D breadboard workbench in real-time.
full_adder.v
OPEN ZOI CODE

Verilog Questions to practice from Top Companies

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module full_adder(
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input a, b, cin,
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output sum, cout
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);
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assign {cout, sum} = a + b + cin;
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endmodule

After Run explore tabs

Build log & simulator prints

OUTPUT

Build succeeded.

Simulator output, errors, and $display lines land here after each run.

Integrated Environment

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Instant Feedback

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Waveform Viewer

Debug your designs with our built-in EPWave-like waveform viewer. Zoom, pan, and analyze signals effortlessly.

Hardware-Focused

Tailored specifically for digital design. Libraries for standard logic gates, flip-flops, and FSMs included.

Problem Library

Practice with hundreds of curated problems ranging from basic logic gates to complex processor design.

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