piramida.cpp: In function 'int main()': piramida.cpp:7: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result piramida.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result piramida.cpp:10: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cconBzQ8.o: In function `main': piramida.cpp:(.text+0x5b): warning: the `gets' function is dangerous and should not be used.