expeval.cpp: In function 'void rezolvare()': expeval.cpp:54: warning: comparison between signed and unsigned integer expressions expeval.cpp: In function 'void backt()': expeval.cpp:138: warning: unused variable 'i' expeval.cpp:138: warning: unused variable 'flag' expeval.cpp: In function 'int main()': expeval.cpp:170: warning: unused variable 'op1' expeval.cpp:170: warning: unused variable 'op2' expeval.cpp:170: warning: unused variable 'j' expeval.cpp:170: warning: unused variable 'der' expeval.cpp:168: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result expeval.cpp:169: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result expeval.cpp:171: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccWHBwhF.o: In function `main': expeval.cpp:(.text+0x5e6): warning: the `gets' function is dangerous and should not be used.