Compilare: main.c: In function 'main': main.c:143:29: warning: unused variable 'stopy' [-Wunused-variable] int startx, stopx, starty, stopy; ^~~~~ main.c:143:21: warning: unused variable 'starty' [-Wunused-variable] int startx, stopx, starty, stopy; ^~~~~~ main.c:143:14: warning: unused variable 'stopx' [-Wunused-variable] int startx, stopx, starty, stopy; ^~~~~ main.c:143:6: warning: unused variable 'startx' [-Wunused-variable] int startx, stopx, starty, stopy; ^~~~~~ main.c:146:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~ main.c:151:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~ main.c:154:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &start.x, &start.y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:155:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &stop.x, &stop.y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~