puteri.cpp: In function 'int main()': puteri.cpp:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result puteri.cpp:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result puteri.cpp:60: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result puteri.cpp:67: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result