#include typedef struct pt { int x; int y; } pt; void plot(int x, int y, char c) { printf("\x1b\x5b%d;%dH%c", y, x, c); } pt pt1 = {20,10}; pt pt2 = {40,30}; pt pt3 = {0,30}; void line(pt a, pt b) { pt change = {b.x - a.x, b.y - a.y}; int ctx = change.x > 0 ? change.x : -change.x; int cty = change.y > 0 ? change.y : -change.y; int ct = ctx > cty ? ctx : cty; for (int t = 0; t <= ct; ++ t) { plot(a.x + change.x * t / ct, a.y + change.y * t / ct, '*'); } } int main() { line(pt1, pt2); line(pt2, pt3); line(pt3, pt1); }