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interactive function, it seldom is Therefore, if the preceding program did not behave as you expected, you now know why Alternatives to getchar( ) Since getchar( ) might not be implemented by your compiler in such a way that it is useful in an interactive environment, you might want to use a different function to read characters from the keyboard Standard C does not define any function that is guaranteed to provide interactive input, but virtually all C compilers do Although these functions are not defined by Standard C, they are commonly used because getchar( ) does not fill the needs of most programmers Two of the most common alternative functions, getch( ) and getche( ), have these prototypes: int getch(void); int getche(void); 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 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 != '');
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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 Although the code in this book will not make further use of getch( ) or getche( ), they may be useful in the programs that you write
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NOTE At the time of this writing, when using Microsoft's Visual C++ compiler, _getche( ) and _getch( ) are not compatible with the standard 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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Reading and Writing Strings 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 stores them at the address pointed to by its argument You can type characters at the keyboard until you strike a carriage return 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 pointer to a character array that receives the characters entered 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 escape sequences as printf( ), such as \t for tab A call to puts ( ) requires far less overhead than the same call to printf( ) because puts( ) can only output a string of characters it cannot output numbers or do format conversions Therefore, puts( ) takes up less space and runs faster than printf( ) For this reason, the puts( ) function is often used when no format conversions are required The puts( ) function returns a nonnegative value if successful or EOF if an error occurs However, when writing to the console, you can usually assume that no error will occur, so the return value of puts( ) is seldom monitored The following statement displays hello:
puts("hello");
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