Eroare de compilare: user.cpp: In function ‘void df1(int)’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void df2(int)’: user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void tare_conexe()’: user.cpp:54: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void df(int)’: user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int cupleaza(int)’: user.cpp:95: warning: comparison between signed and unsigned integer expressions user.cpp:106: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void fcuplaj()’: user.cpp:143: error: return-statement with a value, in function returning 'void' user.cpp:148: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:183: warning: comparison between signed and unsigned integer expressions user.cpp:162: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:163: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:165: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:168: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result