# quake3 / lcc / tst / struct.c

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69``` ```typedef struct point { int x,y; } point; typedef struct rect { point pt1, pt2; } rect; point addpoint(point p1, point p2) { /* add two points */ p1.x += p2.x; p1.y += p2.y; return p1; } #define min(a, b) ((a) < (b) ? (a) : (b)) #define max(a, b) ((a) > (b) ? (a) : (b)) rect canonrect(rect r) { /* canonicalize rectangle coordinates */ rect temp; temp.pt1.x = min(r.pt1.x, r.pt2.x); temp.pt1.y = min(r.pt1.y, r.pt2.y); temp.pt2.x = max(r.pt1.x, r.pt2.x); temp.pt2.y = max(r.pt1.y, r.pt2.y); return temp; } point makepoint(int x, int y) { /* make a point from x and y components */ point p; p.x = x; p.y = y; return p; } rect makerect(point p1, point p2) { /* make a rectangle from two points */ rect r; r.pt1 = p1; r.pt2 = p2; return canonrect(r); } int ptinrect(point p, rect r) { /* is p in r? */ return p.x >= r.pt1.x && p.x < r.pt2.x && p.y >= r.pt1.y && p.y < r.pt2.y; } struct odd {char a[3]; } y = {'a', 'b', 0}; odd(struct odd y) { struct odd x = y; printf("%s\n", x.a); } main() { int i; point x, origin = { 0, 0 }, maxpt = { 320, 320 }; point pts[] = { -1, -1, 1, 1, 20, 300, 500, 400 }; rect screen = makerect(addpoint(maxpt, makepoint(-10, -10)), addpoint(origin, makepoint(10, 10))); for (i = 0; i < sizeof pts/sizeof pts[0]; i++) { printf("(%d,%d) is ", pts[i].x, (x = makepoint(pts[i].x, pts[i].y)).y); if (ptinrect(x, screen) == 0) printf("not "); printf("within [%d,%d; %d,%d]\n", screen.pt1.x, screen.pt1.y, screen.pt2.x, screen.pt2.y); } odd(y); exit(0); } ```