Compilare: user.c: In function ‘main’: user.c:111:5: warning: implicit declaration of function ‘qsort’ [-Wimplicit-function-declaration] qsort(masini, n, sizeof(struct masina), compar); ^ user.c:105:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%i", &n); ^ user.c:109:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%hi%hi", &(masini[i].start), &(masini[i].end)); ^