Compilare: user.cpp: In function ‘int main()’: user.cpp:117:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<strlen(s1); j++) ^ user.cpp:122:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<strlen(s2); j++) ^ user.cpp:98:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:106:40: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s1, 500, f), rem_endl(s1); ^ user.cpp:107:40: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s2, 500, f), rem_endl(s2); ^ user.cpp: In function ‘bool eval3(char*)’: user.cpp:79:12: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return x; ^