Constants and Comments in C/C++

• Symbolic constants
  • Constants are values that do not change inside a computer program

  • Symbolic constants are constant values with a name attached to them

    For example: PI = 3.141592653589793238462643383279502884197...

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• Defining symbolic constants in C/C++
  • Symbolic constants are defined using the #define construct

    Example:

    #define PI 3.141592653589793238462643383279502884197 #define MAX 99999 double x; x = PI;

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• Comments
  • Comments are portion of text that is ignored by the compiler

  • Comments in a C program is enclosed between the following pairs of "brackets": /* ... comment ... */

  • Comments in a C++ program can also be enclosed between the pairs of "brackets": /* ... comment ... */

    In addition, comment in a C++ program can be put after the symbol //

  • Example:

    /* This is a comment in a C or C++ program */ /* * This is an another comment in a C * or C++ program */ // This is a comment in a C++ program // Each comment line must be preceeded by its own //