control1.cpp: In function 'int main()': control1.cpp:9: warning: unused variable 's' control1.cpp:9: warning: unused variable 'ss' control1.cpp:9: warning: unused variable 'sss' control1.cpp:9: warning: unused variable 'ssss' control1.cpp:9: warning: unused variable 'i1' control1.cpp:7: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result control1.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result