Eroare de compilare: user.cpp: In function ‘void iterate(double, double, double)’: user.cpp:15: error: ‘xc’ was not declared in this scope user.cpp:15: error: ‘r’ was not declared in this scope user.cpp:16: error: ‘yc’ was not declared in this scope user.cpp:17: error: ‘x1’ was not declared in this scope user.cpp:17: error: ‘x2’ was not declared in this scope user.cpp:17: error: ‘y2’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result