Compilare: user.cpp: In function 'int main()': user.cpp:20: warning: format '%s' expects type 'char*', but argument 2 has type 'char (*)[51]' user.cpp: In function 'long long int expresie()': user.cpp:31: warning: operation on 'nr' may be undefined user.cpp:35: warning: operation on 'nr' may be undefined user.cpp:37: warning: unused variable 'l' user.cpp: In function 'long long int termen()': user.cpp:48: warning: operation on 'nr' may be undefined user.cpp:52: warning: operation on 'nr' may be undefined user.cpp:54: warning: unused variable 'l' user.cpp: In function 'int valid()': user.cpp:93: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'long long int factor()': user.cpp:63: warning: 'temp' may be used uninitialized in this function