#include <graphics.h> void setusercharsize(int multx, int divx, int multy, int divy);
With setusercharsize, you specify factors by which the width and height are scaled. The default width is scaled by multx : divx, and the default height is scaled by multy : divy. For example, to make text twice as wide and 50% taller than the default, set
multx = 2; divx = 1; multy = 3; divy = 2;