What is macro processor in system programming?

A macro processor is a program that copies a stream of text from one place to another, making a systematic set of replacements as it does so. Macro processors are often embedded in other programs, such as assemblers and compilers. Sometimes they are standalone programs that can be used to process any kind of text.

What is macro expansion in system programming?

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 is a line-by-line macro processor?

The simplest method of achieving this is a line-by-line macro processor. These processors reads the source program and perform all of it’s functions as previously described. But the output lines are passed to the language translators as they are generated, instead of being written to an expanded source file.

What is the difference between micro and macro processor?

Microprocessor is a hardware device found inside the CPU but macroprocessor is a set of programs. Microprocessor can perform arithmetic and logical functions but a macroprocessor can also perform and scanning tasks.

What are the 2 types of macro expansion?

Position Parameter Expansion.

How macros are useful in system software?

Macros are used to make a sequence of computing instructions available to the programmer as a single program statement, making the programming task less tedious and less error-prone. (Thus, they are called “macros” because a “big” block of code can be expanded from a “small” sequence of characters.)

How many parameters can a macro have?

There are two types of macro parameters: positional and keyword.

What are the disadvantages of a general purpose macro processor?

The advantage of using macro is the execution speed of the program fragment. The disadvantage of the macro is the size of the program. The reason is, the pre-processor will replace all the macros in the program by its real definition prior to the compilation process of the program.

How big is macro?

In commercial and residential electrical applications, components such as switches, light bulbs and fans are macro-size objects (greater than 100 micrometers).

What’s between micro and macro?

Meso level In general, a meso-level analysis indicates a population size that falls between the micro and macro levels, such as a community or an organization. However, meso level may also refer to analyses that are specifically designed to reveal connections between micro and macro levels.

How to download ppt of macro and macro processors?

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What do you need to know about macro processors?

1 Macro represents a group of commonly used statements in the source programming language. 2 Macro Processor replaces each macro instruction with the corresponding group of source language statements. 3 Using Macro instructions programmer can leave the mechanical details to be handled by the macro processor.

How does a macro processor make writing code more convenient?

Thus Macro instructions make writing code more convenient. Macro represents a group of commonly used statements in the source programming language. Macro Processor replaces each macro instruction with the corresponding group of source language statements.

How are macro processors used in assembler programming?

Normally, the processor performs no analysis of the text it handles. • The meaning of these statements are of no concern during macro expansion. Therefore, the design of a macro processor generally is machine independent. • Macros mostly are used in assembler language programming.