C++ Tutorials
41. strcat() and strncat() sample program in C++
By: Reema sen : 2007-09-17
Description: Related to strcpy() and strncpy() are the standard functions strcat() and strncat(). The former concatenates one string to another; that is, it appends the string it takes as its second parameter to the end of the string it takes as its first parameter. strncat(), as you might expect, appends the first n characters of one string to the other. The sample program illustrates their use.
42. strcpy() and strncpy() sample program in C++
By: Sam Chen : 2007-09-17
Description: The second most popular function in string.h probably was strcpy(), which copied one string to another. This may now be diminished somewhat as C-style null-terminated strings have become less important in C++; typically, string manipulation is done from within a vendor-supplied or user-written string class. Nonetheless, your string class must support an assignment operator and a copy constructor, and often these are implemented using strcpy(), as illustrated in Listing below.
43. strlen() sample program in C++
By: Tamil Selvan : 2007-09-17
Description: The most popular library is almost certainly the string library, with perhaps the function strlen() called most often. strlen() returns the length of a null-terminated string. Listing below illustrates its use.
44. Using #define, The Preprocessor and the Compiler in C++
By: Abinaya : 2007-09-17
Description: Every time you run your compiler, your preprocessor runs first. The preprocessor looks for preprocessor instructions, each of which begins with a pound symbol (#). The effect of each of these instructions is a change to the text of the source code. The result is a new source code file, a temporary file that you normally don't see, but that you can instruct the compiler to save so that you can examine it if you want to.
45. assert() example program in C++
By: Charles : 2007-09-17
Description: Many compilers offer an assert() macro. The assert() macro returns TRUE if its parameter evaluates TRUE and takes some kind of action if it evaluates FALSE. Many compilers will abort the program on an assert() that fails; others will throw an exception.
46. assert() Versus Exceptions in C++
By: Daniel Malcolm : 2007-09-17
Description: It is important to note that assert() is not intended to handle runtime error conditions such as bad data, out-of-memory conditions, unable to open file, and so forth. assert() is created to catch programming errors only. That is, if an assert() "fires," you know you have a bug in your code.
47. Getting User Input Using cin in C++
By: Fazal : 2007-09-17
Description: The global object cin is responsible for input and is made available to your program when you include iostream.h. In most of the examples in this site, you used the overloaded extraction operator (>>) to put data into your program's variables. How does this work? The syntax, as you may remember, is the following:
48. cin.ignore() in C++
By: Grenfel : 2007-09-17
Description: At times you want to ignore the remaining characters on a line until you hit either end of line (EOL) or end of file (EOF). The member function ignore() serves this purpose. ignore() takes two parameters, the maximum number of characters to ignore and the termination character. If you write ignore(80,'\n'), up to 80 characters will be thrown away until a newline character is found. The newline is then thrown away and the ignore() statement ends. Listing below illustrates the use of ignore().
49. Using peek() and putback() with cin in C++
By: Henry : 2007-09-17
Description: The input object cin has two additional methods that can come in rather handy: peek(), which looks at but does not extract the next character, and putback(), which inserts a character into the input stream. Listing below illustrates how these might be used.
50. Using cout.width() in C++
By: Ivan Lim : 2007-09-17
Description: The default width of your output will be just enough space to print the number, character, or string in the output buffer. You can change this by using width(). Because width() is a member function, it must be invoked with a cout object. It only changes the width of the very next output field and then immediately reverts to the default. Listing below illustrates its use.