Compilare: main.cpp: In member function 'void nr_mari::scadere(nr_mari)': main.cpp:31:13: warning: unused variable 'l' [-Wunused-variable] int l=strlen(val); ^ main.cpp: In member function 'void nr_mari::adunare(nr_mari)': main.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (transfer && l==strlen(val)) ~^~~~~~~~~~~~~ main.cpp:89:23: warning: statement has no effect [-Wunused-value] val[l]=='0'; ~~~~~~^~~~~ main.cpp: In member function 'void nr_mari::inmultire(nr_mari)': main.cpp:105:13: warning: unused variable 'transfer' [-Wunused-variable] int transfer=0, c; ^~~~~~~~