expeval.cpp: In function 'int main()': expeval.cpp:21: warning: unused variable 'j' expeval.cpp:26: warning: unused variable 'cnt1' expeval.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result expeval.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result expeval.cpp:23: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccowknQT.o: In function `main': expeval.cpp:(.text+0x10f): warning: the `gets' function is dangerous and should not be used.