Compilare: user.cpp: In function ‘int read()’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=start; i<strlen(nr); i++) ^ user.cpp: In function ‘int main()’: user.cpp:50:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spiridusi.in", "r", stdin); ^ user.cpp:51:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spiridusi.out", "w", stdout); ^ user.cpp: In function ‘int read()’: user.cpp:16:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", nr); ^