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In computer programming, unreachable code is part of the source code of a program which can never be executed because there exists no control flow path to the code from the rest of the program. [ 1 ] Unreachable code is sometimes also called dead code , [ 2 ] [ 3 ] although dead code may also refer to code that is executed but has no effect on ...
C++11 additionally defines many of the same values found within the POSIX specification. [ 6 ] Traditionally, the first page of Unix system manuals , named intro(2), lists all errno.h macros, but this is not the case with Linux , where these macros are instead listed in the errno(3).
Since the C99 standard, C supports escape sequences that denote Unicode code points, called universal character names. They have the form \u hhhh or \U hhhhhhhh , where h stands for a hex digit. Unlike other escape sequences, a universal character name may expand into more than one code unit.
This is a list of operators in the C and C++ programming languages.. All listed operators are in C++ and lacking indication otherwise, in C as well. Some tables include a "In C" column that indicates whether an operator is also in C. Note that C does not support operator overloading.
The most basic way to implement checkpointing is to stop the application, copy all the required data from the memory to reliable storage (e.g., parallel file system), then continue with execution. [1] In the case of failure, when the application restarts, it does not need to start from scratch.
/* 'The i++ part is the cleanup for the for loop.' */ for i = 0; i < 100; i ++ print i end import type list = [10, 20, 30, 40, 50] /* 'Even in a for each loop, code cleanup with an incremented variable is still needed.' */ i = 0 for each element of list list [i] ^= 2 // 'Squares the element.' print string (element) +" is now... "+ string (list [i]) i ++ end
code which is executed but has no external effect (e.g., does not change the output produced by a program; known as dead code). A NOP instruction might be considered to be redundant code that has been explicitly inserted to pad out the instruction stream or introduce a time delay, for example to create a timing loop by "wasting time".
Dead code is normally considered dead unconditionally. Therefore, it is reasonable attempting to remove dead code through dead-code elimination at compile time. However, in practice it is also common for code sections to represent dead or unreachable code only under certain conditions, which may not be known at the time of compilation or assembly.