...usage of #pragma and how can i direct the...

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Question by shaji kumar.V.K
Submitted on 2/26/2004
Related FAQ: comp.lang.c Answers (Abridged) to Frequently Asked Questions (FAQ)
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what is the usage of #pragma and how can i direct the compiler to use specific options?plz. explain with suitable examples.

Answer by harish
Submitted on 4/12/2004
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# pragmas are the extended features provided with ur compiler.so there will be diffrent types.please check with ur compiler. eg.most of the times u need to mix high level code with ur low level assembler code inorder to fine tune ur program either for faster execution or reducing memory usage. so u can use # pragma asm and # pragma endasm in ur program # include <stdio.h> int main (void) { .... here u can have some main code # pragma asm write the assemble code here movlw 25,w,0 e.g # pragma endasm this will end low level code continue with main code here }

Answer by Sibani
Submitted on 1/9/2007
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#pragma is also used to tell the compiler which part of the code is your ISR. e.g. #pragma interrupt void start_ISR() { /* some code */ } The above code tells your compiler that start_ISR is the ISR for your code. Some other usage of #pragma is also for packing in structure fields.

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