Compilare: user.cpp: In function ‘int factor()’: user.cpp:57:24: warning: unused variable ‘nr’ [-Wunused-variable] int val=0,semn = 1,nr=0; ^ user.cpp: In function ‘int main()’: user.cpp:91:11: warning: unused variable ‘i’ [-Wunused-variable] int n,i; ^ user.cpp:92:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100001,in); ^