Compilare: user.c: In function ‘main’: user.c:9:36: warning: unused variable ‘p’ [-Wunused-variable] char *line1, *c, a[100], b[100], *p, *line2, ch; ^ user.c:9:27: warning: unused variable ‘b’ [-Wunused-variable] char *line1, *c, a[100], b[100], *p, *line2, ch; ^ user.c:9:19: warning: unused variable ‘a’ [-Wunused-variable] char *line1, *c, a[100], b[100], *p, *line2, ch; ^ user.c:13:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("convertor.in", "r", stdin); ^ user.c:15:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:21:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:24:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:28:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:29:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:31:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:33:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:35:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^ user.c:36:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^