the difference of some Input function

the difference of some Input function

1 /* 2 Subject: the difference of gets(),getch(),getchar() and getline() 3 Author: shexinwei 4 School: xidian university 5 Date: 2010-09-09 6 Laguage: C++ 7 IDE: visual studio 6.o 8 Version: 1.0 9 Modify Time: 2010-09-09 10 */ 11 #include < iostream > 12 using namespace std; 13 #include < conio.h > 14 #define MAX_LEN 20 15 int main() 16 { 17 18 // gets() : Get a line from the stdin stream. 19 // Get a line from the stdin stream. 20 21 cout << " the function gets(): " << endl; 22 char buffer[MAX_LEN]; 23 gets(buffer); 24 cout << buffer << endl; 25 26 // getchar(): 27 // marco: #define getchar() getc(stdin) File: STDIO.H Get a character from a file; 28 // function: _CRTIMP int __cdecl getchar(void); File: STDIO.H Get a character from stdin; 29 char tmp = 0 ; 30 cout << endl << endl << " the function getchar(): " << endl; 31 cout << ( char )getchar(tmp) << endl; 32 33 // getline(): 34 // basic_istream<Elem, Tr>& getline(char_type *_Str, streamsize _Count); 35 // Gets a line from the input stream. 36 cout << endl << endl << " the function getline(): " << endl; 37 cin.getline(buffer,MAX_LEN); 38 cout << buffer << endl; 39 40 // getch(): 41 // This POSIX function is deprecated beginning in Visual C++ 2005. Use the ISO C++ conformant _getch instead 42 // Gets a character from the console without echo. 43 // int _getch( void ); 44 // Returns the character read. There is no error return. 45 // Headers: <conio.h> 46 cout << endl << endl << " the function getch(): " << endl; 47 tmp = getch(); // without echo 48 // cout<<tmp<<endl; // print the character 49 50 51 system( " pause " ); 52 return 0 ; 53 54 }