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Format strings in C

#include <stdio.h> #include <stdlib.h> #include <string.h> #define POINT_FORMAT "(%lf; %lf)" typedef struct Point { double x, y; } Point; void process(Point q) { q.x += 5; Point u = { .x = 19.5, .y = 0.25 }; printf("My point q: "POINT_FORMAT" and my point u "POINT_FORMAT"\n", q.x, q.y, u.x, u.y); } int main(int argc, char* argv[]) { Point p = { .x = 10, .y = 25 }; process(p); snprintf(buf, 100, POINT_FORMAT"\n", p.x, p.y); printf("%s", buf); return 0; }