Compilare: user.cpp: In function ‘int main()’: user.cpp:37: warning: format ‘%s’ expects type ‘char*’, but argument 2 has type ‘char (*)[30]’ user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp:55: warning: comparison between signed and unsigned integer expressions 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:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int cifra(char)’: user.cpp:19: warning: control reaches end of non-void function user.cpp: In function ‘int main()’: user.cpp:27: warning: ‘ok’ may be used uninitialized in this function