Compilare: user.cpp: In function 'void DF_pl(long int)': user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void DF_mn(long int)': user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:85: warning: comparison between signed and unsigned integer expressions user.cpp:105: warning: comparison between signed and unsigned integer expressions user.cpp:107: warning: format '%ld' expects type 'long int', but argument 2 has type 'size_t' user.cpp:109: warning: comparison between signed and unsigned integer expressions