Eroare de compilare: user.cpp: In function ‘void schimb(int, int)’: user.cpp:9: error: ‘k’ was not declared in this scope user.cpp:12: error: ‘a’ was not declared in this scope user.cpp:24: error: ‘a’ was not declared in this scope user.cpp:26: error: ‘a’ was not declared in this scope user.cpp:28: error: ‘a’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:43: error: ‘n’ was not declared in this scope user.cpp:45: error: ‘a’ was not declared in this scope user.cpp:48: error: ‘a’ was not declared in this scope user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result