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Why does MPI_Init accept pointers to argc and argv?


Why does MPI_Init accept pointers to argc and argv?

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Why does MPI_Init accept pointers to argc and argv?
Tag : development , By : Lars
Date : January 10 2021, 01:57 PM


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Is it compulsory to write int main(int argc, char *argv[]), can't use some other names instead of argc and *argv[]?


Tag : c , By : Saurabh
Date : March 29 2020, 07:55 AM
this one helps. If you want your program to understand a single integer command line argument, you still have to use argc and argv. Something like this ought to do it:
int main(int argc, char *argv[]) {

    if (argc < 2) {
        fprintf(stderr, "Need a command line argument.\n");
        exit(1);
    }

    int arg = atoi(argv[1]);
    // now you have an integer
    // do whatever with it...
}

Significance of argc and argv in int main( int argc, char** argv ) in OpenCV


Tag : cpp , By : Karina
Date : March 29 2020, 07:55 AM
will help you In the following program for loading and displaying image in openCV
main( int argc, char** argv )
           |            |
           |            |
           |            +----pointer to supplied arguments
           +--no. of arguments given at command line (including executable name)
display_image image1.jpg
argc will be 2
argv[0] points to display_image
argv[1] points to image1

if(argc !=2 )
   ^^ Checks whether no. of supplied argument is not exactly two

Where does this declaration come from: main _2a((argc,argv), int argc, char * argv[])


Tag : c , By : TBG
Date : March 29 2020, 07:55 AM
I wish this help you We just have to expand the macro. You can use gcc -E to invoke just the preprocessor; it will also expand all #include directives, so the output is going to be ugly.
But let's do it manually. The arguments to the macro are token sequences, not expressions.
# define _2a(list,a1,a2)                 list a1;a2;
main _2a((argc,argv), int argc, char * argv[])
{
...
}
main (argc,argv) int argc; char * argv[];
{
...
}
main(argc, argv)
int argc;
char *argv[];
{
    ...
}
#define _2a(list,a1,a2) (a1, a2)
main (int argc, char * argv[])
{
...
}
#ifdef __STDC__
#define _2a(list,a1,a2) (a1, a2) 
#else
#define _2a(list,a1,a2) list a1;a2;
#endif

Pass (argc, argv) variables to a function as (argv, argc) inside main in C++


Tag : cpp , By : user109285
Date : March 29 2020, 07:55 AM

int main(int argc,char* argv[]) why does argc gives 2 argument?


Tag : cpp , By : Carter
Date : March 29 2020, 07:55 AM
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