cifre4.cpp: In function 'int main()': cifre4.cpp:15: warning: comparison between signed and unsigned integer expressions cifre4.cpp:24: warning: comparison between signed and unsigned integer expressions cifre4.cpp:33: warning: array subscript has type 'char' cifre4.cpp:35: warning: comparison between signed and unsigned integer expressions cifre4.cpp:42: warning: comparison between signed and unsigned integer expressions cifre4.cpp:45: warning: array subscript has type 'char' cifre4.cpp:47: warning: comparison between signed and unsigned integer expressions cifre4.cpp:57: warning: comparison between signed and unsigned integer expressions cifre4.cpp:59: warning: comparison between signed and unsigned integer expressions cifre4.cpp:74: warning: comparison between signed and unsigned integer expressions cifre4.cpp:77: warning: comparison between signed and unsigned integer expressions