Описание тега dead-code

Dead code is code in the source code of a program which is executed but whose result is never used or a code that can never be reached or used.

Dead code is waste of computing power and might result of unexpected behavior to the program.

Examples:

int foo (int a, int b)
{
    int c = a + b;  // dead code - executes and result never used 
    return a - b;
}

void foo ()
{
     bool a = true;
     if (!a)
     {
         // dead code - never called
     }
}