reteta.cpp: In function `void erase_spaces()': reteta.cpp:22: warning: comparison between signed and unsigned integer expressions reteta.cpp: In function `int create_number(int)': reteta.cpp:34: warning: comparison between signed and unsigned integer expressions reteta.cpp: In function `void needed_time()': reteta.cpp:44: warning: comparison between signed and unsigned integer expressions reteta.cpp: In function `void copy_dates(int&)': reteta.cpp:64: warning: comparison between signed and unsigned integer expressions reteta.cpp: In function `void read()': reteta.cpp:106: warning: comparison between signed and unsigned integer expressions reteta.cpp:111: warning: comparison between signed and unsigned integer expressions