submult.cpp: In function 'int main()': submult.cpp:24: warning: unused variable 'st' submult.cpp:24: warning: unused variable 's' submult.cpp:24: warning: unused variable 'j' submult.cpp:24: warning: unused variable 'k' submult.cpp:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result submult.cpp:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result submult.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result submult.cpp:24: warning: 'nr1f' may be used uninitialized in this function submult.cpp:24: warning: 'nr2f' may be used uninitialized in this function