Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Summarize the distinction between an external variable definition and an external variable declaration.
When we have ''declared'' a variable, we have meant that we have told the compiler about the variable; i.e. its type and its name, as well as allocated a memory cell for the variable (either locally or globally). This latter action of the compiler, allocation of storage, is more properly called the definition of the variable. The stricter definition of declaration is simply to describe information ''about'' the variable. For automatic and register variables, there is no difference between definition and declaration. The process of declaring an automatic or a register variable defines the variable name and allocates appropriate memory. However, for external variables, these two operations may occur independently. This is important because memory for a variable must be allocated only once, to ensure that access to the variable always refers to the same cell.
If an external variable is to be used in a file other than the one in which it is defined, a mechanism is needed to ''connect'' such a use with the uniquely defined external variable cell allocated for it. This process of connecting the references of the same external variable in different files, is called resolving the references.
External variables may be defined and declared with a declaration statement outside any function, with no storage class specifier. Such a declaration allocates memory for the variable. A declaration statement may also be used to simply declare a variable name with the extern storage class specifier at the beginning of the declaration. Such a declaration specifies that the variable is defined elsewhere, i.e. memory for this variable is allocated in another file. Thus, access to an external variable in a file other than the one in which it is defined is possible if it is declared with the keyword extern; no new memory is allocated. Such a declaration tells the compiler that the variable is defined elsewhere, and the code is compiled with the external variable left unresolved. The reference to the external variable is resolved during the linking process
What is a flip-flop? What is the difference between a latch and a flip-flop? List out the application of flip-flop. Ans. Flip-Flop: It is a fundamental memory element utilize
Q. Write a menu driven program to find 9's and 10's complement of a decimal number using file. Perform necessary validation with proper message that entered numbers must be de
Three firm capabilities that are critical for superior firm performance in e-commerce are:- 1. Information technology capability, 2. Strategic flexibility, and 3. Tr
10 k Ohm pulls up on MCLR so that the ICD can force 0, +5, +13 volts on this pin. RB6 and RB7 used for PGC and PGD respectively between target and ICD2 module. Some of the requi
What is reentrant tasks and functions Tasks and functions without optional keyword automatic are static , with all declared items being statically allocated. These items will b
Differentiate between Gateways and Bridges. A machine that connects a LAN to the Internet is termed as a gateway. The gateway machine is responsible for routing packets that ar
Combinational/Sequential Logic design with Integrated Circuits (Dual in line package) Car wash concept with the following steps in a Combinational Logic Diagram: 1. Start
Give the sequence of procedure calls for both server and client for connect ion-oriented application. In connection oriented communication the order of Procedure call
how to become an ict enginer
Elaborate protected mode memory addressing in brief. Protected mode interrupt: In protected mode, interrupts have exactly the same assignments as in real mode though int
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd