Argv and Argc
Hallo guys I'm having some trouble with a question. The question goes like this: g++ -S fred.c >fred.asm is entered into the command line in windows using the gcc compiler.
What will the values of the arguments be passed to the g++ main function?
What will happen to the file fred.asm?
If g++ succeeds in generating the assembler file what will the value of main return function be?
My guess is that argc will be 4 and argv will be g++ -S fred.c. I am unsure if >fred.asm will be included in argv?
That is the question but I am wondering how do I capture the arguments argc and argv from the command line?
Since I am new to this forum, is this forum only for c++ or is just c also allowed?
Any help appreciated.
What will the values of the arguments be passed to the g++ main function?
What will happen to the file fred.asm?
If g++ succeeds in generating the assembler file what will the value of main return function be?
My guess is that argc will be 4 and argv will be g++ -S fred.c. I am unsure if >fred.asm will be included in argv?
That is the question but I am wondering how do I capture the arguments argc and argv from the command line?
Since I am new to this forum, is this forum only for c++ or is just c also allowed?
Any help appreciated.
Last edited on
But you can easily test it yourself. Write dummy program (and call its executable "g++" if you like) and make it print out argv and argc. :)
I think ">fred.asm" would not be included as any redirection. Program is supposed to work identically independent of whether its output would be redirected or not.
It looks like the pure C is all right at this forum.
I think ">fred.asm" would not be included as any redirection. Program is supposed to work identically independent of whether its output would be redirected or not.
It looks like the pure C is all right at this forum.
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Hi there,
As C is a subset of C++, C questions are allowed, but you will usually get replies which include and promote C++ examples and explanations.
As for the question (if I understand it correctly): First '>' is a command redirection operator within the windows command shell - it will thus not be passed to g++, but rather the output produced by g++ will be sent to the file fred.asm.
There are only two arguments to g++:
-S = Only compile the source files, do not assemble (or link) them.
fred.c = your source file
For more information:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true
http://gcc.gnu.org/onlinedocs/gcc-3.0/gcc_3.html#SEC5
On a sidenote: I'm not sure that line would work, the documentation does not state that g++ -S sends its output to stdout, but rather that it creates a new file.
Hope that helps, please do let us know if you have any further questions.
All the best,
NwN
| Blindesambok wrote: |
|---|
| Since I am new to this forum, is this forum only for c++ or is just c also allowed? |
As C is a subset of C++, C questions are allowed, but you will usually get replies which include and promote C++ examples and explanations.
As for the question (if I understand it correctly): First '>' is a command redirection operator within the windows command shell - it will thus not be passed to g++, but rather the output produced by g++ will be sent to the file fred.asm.
There are only two arguments to g++:
-S = Only compile the source files, do not assemble (or link) them.
fred.c = your source file
For more information:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true
http://gcc.gnu.org/onlinedocs/gcc-3.0/gcc_3.html#SEC5
On a sidenote: I'm not sure that line would work, the documentation does not state that g++ -S sends its output to stdout, but rather that it creates a new file.
Hope that helps, please do let us know if you have any further questions.
All the best,
NwN
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