To compile this demo, you must install the following:

Go to C and C++ Installation and follow the instructions.

Wasmer is an open-source runtime for executing WebAssembly on the Server.

Wasienv is a tool to compile different programming languages to WebAssembly, so you can run your programs on the Browser, or in the Server.

You will find wasmtime at wasmtime.dev

We will create a Simple C++ Program that will return us the fibonacci sequence of an Integer Input.

Create a folder with the naming convention that you prefer. In My Case, I will be using "C++-to-WASM" as the name of my folder.

mkdir C++-to-WASM
cd C++-to-WASM

Create a file named FibonacciSequence.cpp, again you can choose any name for your file but make sure that you suffix it with the extension .cpp.

// Simple Program to calculate Fibonacci Sequence of an integer input
#include<iostream>
using namespace std;
int FibonacciSequence(int num) {
    if(num <= 1) {
        return num ;
    }
    return FibonacciSequence(num-1) + FibonacciSequence(num-2);
}
int main(){
    cout << "Enter the Number" << endl;
    int n ;
    cin  >> n ;
    
    cout << "Fibonacci Sequence term at " << n << "  " << "is " << FibonacciSequence(n) << endl;
}

1. Compiling Using g++

g++ FibonacciSequence.cpp

2. Compile to WASM Binary using the following Command:

Since the Code has been written in C++, we need to figure out a way to generate a WebAssembly Binary. That's why we will be using wasienv in order to generate a .wasm binary from this cpp file.

When you have your cpp file created, you can execute wasic++

 wasic++ Fibonacci.cpp -o FibonacciBinary.wasm

Note that while executing this command, it might generate some warnings but you can ignore them.

3. Now, you will have a new FibonacciBinary.wasm file ready in your Directory

4. Executing it using WASM Runtime

wasmtime FibonacciBinary.wasm