How are C macros expanded?
How are C macros expanded?
When the program run and if the C preprocessor sees an instance of a macro within the program code, it will do the macro expansion. It replaces the macro template with the value of macro expansion. The macro on the other hand only requires you to change the value of the #define directive.
What is macro expansion?
Macro definition and Expansion A macro consists of name, set of formal parameters and body of code. The use of macro name with set of actual parameters is replaced by some code generated by its body. This is called macro expansion.
What are vim macros?
In Vim, a macro is a feature that allows you to record a sequence of commands that you use to perform a given task. You then execute that macro many times to repeat the same job in an automated way. Macros improve your workflow and are a great time saver.
How do you call a macro in vim?
In Vim, the word “macro” may refer to: A sequence of commands recorded to a register (this tip)….Running a macro
- Start recording keystrokes by typing qq .
- End recording with q (first press Escape if you are in insert mode).
- Play the recorded keystrokes by hitting space.
What is MNT and MDT?
Macro-Definition Table (MDT), to store the body of macro defns. Macro-Definition Table Counter (MDTC), to mark next available entry MDT. Macro- Name Table (MNT), used to store names of macros. Macro Name Table counter (MNTC), used to indicate the next available entry in MNT.
Where macros are stored in C?
Macros are not stored in memory anywhere in the final program but instead the code for the macro is repeated whenever it occurs. As far as the actual compiler is concerned they don’t even exist, they’ve been replaced by the preprocessor before they get that far.
How do you use Vim?
If you’re on a Linux system right now, open up a terminal and type vim filename. Enter insert mode and type a bit (or copy some of the text from this article into Vim) and then hit Escape to start practicing movement around the file. Once you feel you’re getting the hang of it, it’s time to try some editing.
Why are marks used in Vim?
A mark allows you to record your current position so you can return to it later. There is no visible indication of where marks are set. Each file has a set of marks identified by lowercase letters (a-z).
How many modes does Vim have?
vim has two “modes”: COMMAND mode and INSERT mode. In COMMAND mode, you execute commands (like undo, redo, find and replace, quit, etc.). In INSERT mode, you type text. There is a third mode, VISUAL mode, that is used to highlight and edit text in bulk.
What are DC and DS statements?
The two primary data definition statements are the DS directive and the DC directive. The DS directive allocates space for a label; the DC allocates space and assigns an initial value. These declaratives are statements that assign storage locations.
How are macro processors implemented?
STEP 1: Start the program execution. STEP 2: Macro instructions are included in a separate file. output. STEP 4: Print all other instructions such as start,load,store,add,sub etc with their values.
How do I record and play a Vim macro?
High Level Steps to Record and Play inside Vim. Start recording by pressing q, followed by a lower case character to name the macro. Perform any typical editing, actions inside Vim editor, which will be recorded. Stop recording by pressing q.
How to record and play a sequence of actions inside Vim editor?
Using Vim Macro feature you can record and play a sequence of actions inside the editor. This article explains how to perform record and play inside Vi and Vim editor using two detailed examples. To repeat macros multiple times, press : NN @ macro name.
How do I stop the recording in Vim?
Stop the recording Press q to stop the recording. You’ll notice that recording message at the bottom of the vim is now gone. 7. Repeat the recording 98 times. @a repeats the macro “a” one time. 98@a repeats the macros “a” 98 times generating the sequence number 1 – 100 as shown below using macros.
How to perform Vim sequence test 98 times?
By placing the cursor at the 2nd line, press Ctrl+a which increment the number to 2. as shown below. $ vim sequence-test.txt 1. 2. Note: vim will still show recording at the bottom. 6. Stop the recording Press q to stop the recording. You’ll notice that recording message at the bottom of the vim is now gone. 7. Repeat the recording 98 times.
