C:\sniff.cpp:74: error: `main' must return `int'

C:\sniff.cpp: In member function `void sniffing::sniff(int, int)':
C:\sniff.cpp:93: error: invalid conversion from `u_char*' to `char*'
C:\sniff.cpp:93: error:   initializing argument 2 of `int recv(SOCKET, char*, int, int)'

C:\sniff.cpp:106: error: invalid conversion from `u_char*' to `char*'
C:\sniff.cpp:106: error:   initializing argument 1 of `char* strcpy(char*, const char*)'
C:\sniff.cpp:109: error: invalid conversion from `u_char*' to `char*'
C:\sniff.cpp:109: error:   initializing argument 1 of `char* strcpy(char*, const char*)'

C:\sniff.cpp: In member function `void sniffing::createsocket(int)':
C:\sniff.cpp:151: error: invalid conversion from `u_char*' to `const char*'
C:\sniff.cpp:151: error:   initializing argument 1 of `hostent* gethostbyname(const char*)'