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For most compilers, the prototypes for these functions are found in the header file conioh For some compilers, these functions have a leading underscore For example, in Microsoft's Visual C++, they are called _getch( ) and _getche( ) The getch( ) function waits for a keypress, after which it returns immediately It does not echo the character to the screen The getche( ) function is the same as getch( ), but the key is echoed You will frequently see getche( ) or getch( ) used instead of getchar( ) when a character needs to be read from the keyboard in an interactive program However, if your compiler does not support these alternative functions, or if getchar( ) is implemented as an interactive function by your compiler, you should substitute getchar( ) when necessary For example, the previous program is shown here using getch( ) instead of getchar( ):
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#include <stdioh> #include <conioh> #include <ctypeh> int main(void) { char ch; printf("Enter some text (type a period to quit)\n"); do { ch = getch(); if(islower(ch)) ch = toupper(ch); else ch = tolower(ch); putchar(ch); } while (ch != ''); return 0; }
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When you run this version of the program, each time you press a key, it is immediately transmitted to the program and displayed in reverse case Input is no longer line-buffered While the code in this book will not make further use of getch( ) or getche( ), they may be useful in the programs that you write At the time of this writing, when using Microsoft's Visual C++ compiler, _getche( ) and _getch( ) are not compatible with the standard C/C++ input functions, such as scanf( ) or gets( ) Instead, you must use special versions of the standard functions, such as cscanf( ) or cgets( ) You will need to examine the Visual C++ documentation for details
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The next step up in console I/O, in terms of complexity and power, are the functions gets( ) and puts( ) They enable you to read and write strings of characters The gets( ) function reads a string of characters entered at the keyboard and places them at the address pointed to by its argument You may type characters at the keyboard until you press ENTER The carriage return does not become part of the string; instead, a null terminator is placed at the end and gets( ) returns In fact, you cannot use gets( ) to return a carriage return (although getchar( ) can do so) You can correct typing mistakes by using the backspace key before pressing ENTER The prototype for gets( ) is char *gets(char *str); where str is a character array that receives the characters input by the user gets( ) also returns str The following program reads a string into the array str and prints its length:
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#include <stdioh> #include <stringh> int main(void) { char str[80]; gets(str); printf("Length is %d", strlen(str)); return 0; }
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You need to be careful when using gets( ) because it performs no boundary checks on the array that is receiving input Thus, it is possible for the user to enter more characters than the array can hold While gets( ) is fine for sample programs and simple utilities that only you will use, you will want to avoid its use in commercial code One alternative is the fgets( ) function described in the next chapter, which allows you to prevent an array overrun The puts( ) function writes its string argument to the screen followed by a newline Its prototype is: int puts(const char *str); puts( ) recognizes the same backslash codes as printf( ), such as '\t' for tab A call to puts( ) requires far less overhead than the same call to printf( ) because puts( )
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