Learn WebAssembly

The C++ file

Create a new directory in your /book-examples directory named /compile-with-llvm. Create a new file in the /compile-with-llvm directory named main.cpp and populate it with the following contents:

#include <stdbool.h>#define BOUNDS 255#define RECT_SIDE 50#define BOUNCE_POINT (BOUNDS - RECT_SIDE)bool isRunning = true;typedef struct Rect {  int x;  int y;  char direction;} Rect;struct Rect rect;void updateRectLocation() {    if (rect.x == BOUNCE_POINT) rect.direction = 'L';    if (rect.x == 0) rect.direction = 'R';    int incrementer = 1;    if (rect.direction == 'L') incrementer = -1;    rect.x = rect.x + incrementer;    rect.y = rect.y + incrementer;}extern "C" {extern int jsClearRect();extern int jsFillRect(int x, int y, int width, int height);