Compilare: user.cpp: In function ‘int main()’: user.cpp:46:21: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s1+1,mx,f); ^ user.cpp:47:21: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s2+1,mx,f); ^