Created
December 28, 2017 05:14
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Square Root With WebAssembly
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| #include <stdio.h> | |
| #include <stdint.h> | |
| #include <emscripten/emscripten.h> | |
| double EMSCRIPTEN_KEEPALIVE sq_root(double count) { | |
| if (count == 0) { | |
| return 1; | |
| } else if (count == 1) { | |
| return 2; | |
| } | |
| return count * count; | |
| } |
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| <!doctype html> | |
| <html lang="en-us"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| <title>Emscripten-Generated Code</title> | |
| </head> | |
| <body> | |
| <button class="mybutton">Run myFunction</button> | |
| <p id="count">0</p> | |
| <script type='text/javascript'> | |
| function toFixed(x) { | |
| if (Math.abs(x) < 1.0) { | |
| var e = parseInt(x.toString().split('e-')[1]); | |
| if (e) { | |
| x *= Math.pow(10,e-1); | |
| x = '0.' + (new Array(e)).join('0') + x.toString().substring(2); | |
| } | |
| } else { | |
| var e = parseInt(x.toString().split('+')[1]); | |
| if (e > 20) { | |
| e -= 20; | |
| x /= Math.pow(10,e); | |
| x += (new Array(e+1)).join('0'); | |
| } | |
| } | |
| return x; | |
| } | |
| document.querySelector('.mybutton').addEventListener('click', function(){ | |
| var number = document.getElementById("count").innerHTML; | |
| var result = _sq_root(number); | |
| if (result == Infinity) { | |
| result = 0; | |
| } | |
| document.getElementById('count').innerHTML = toFixed(result); | |
| }); | |
| </script> | |
| <script async type="text/javascript" src="SqureRoot.js"></script> | |
| </body> | |
| </html> |
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emcc -o SquareRoot.js SquareRoot.c -O3 -s WASM=1 -s NO_EXIT_RUNTIME=1 -s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall"]'