zoo.cpp: In function 'int main()': zoo.cpp:127: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result zoo.cpp:128: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result zoo.cpp:130: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result zoo.cpp:132: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result zoo.cpp:138: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result zoo.cpp:141: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result