acerc.cpp: In function 'void AddCircle(double, double)': acerc.cpp:21: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x acerc.cpp: In function 'int main()': acerc.cpp:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result acerc.cpp:59: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result acerc.cpp:61: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result acerc.cpp:63: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result