Compilare: user.c: In function ‘main’: user.c:15:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("convertor.out", "wt", stdout); ^ user.c: In function ‘solveKeys’: user.c:45:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(str, 1025, pFile); ^ user.c: In function ‘solveValues’: user.c:86:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(str, 1025, pFile); ^ user.c: In function ‘solveKeys’: user.c:51:24: warning: ‘ptr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] strncpy(aux, ptr1 + 1, str + i - ptr1 - 1); ^ user.c:75:6: warning: attempt to free a non-heap object ‘str’ [-Wfree-nonheap-object] free(str); ^ user.c: In function ‘solveValues’: user.c:118:12: warning: ‘ptr2’ may be used uninitialized in this function [-Wmaybe-uninitialized] nfprint(ptr1, ptr2 - ptr1); ^ user.c:118:12: warning: ‘ptr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.c:129:6: warning: attempt to free a non-heap object ‘str’ [-Wfree-nonheap-object] free(str); ^