puteri.cpp: In function 'int main()': puteri.cpp:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result puteri.cpp:90: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result puteri.cpp:93: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result puteri.cpp:99: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result