Help using argc/argv in assignment Post: 302916924

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Homework and Emergencies Homework & Coursework Questions Help using argc/argv in assignment Post 302916924 by miniviking10 on Friday 12th of September 2014 02:12:32 PM

09-12-2014

Registered User

Quote:

Originally Posted by blackrageous

Code:

#include <stdio.h>

int main (int argc, char *argv[])
{
        char *message = "Hello ";
        printf("%s ", message);

if(argc == 2)
{
       printf("%s!\n", argv[1]);
}
else
{
        printf ("world!\n");
}

return 0;

}

Thank you my friend. This works. The only thing that did not work is the part I bolded in the quote. It keeps printing "n" at the end of the statement instead of doing a new line(which is what I think you're trying to do here?). It's not a big deal because I can cut out that part and get the right output anyway.

---------- Post updated at 01:12 PM ---------- Previous update was at 01:10 PM ----------

Quote:

Originally Posted by Corona688

Another way:

Code:

int main(int argc, char *argv[])
{
        char *message="Hello";
        char *who="World!";
        if(argc == 2) 
        {
                who=argv[1];
        }

        printf("%s %s\n", message, who);
        return(0);
}

Thanks for the alternate solution. Gives me something to think about as well.

miniviking10

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LEARN ABOUT LINUX

bswap_32

BSWAP(3)						     Linux Programmer's Manual							  BSWAP(3)

NAME

       bswap_16, bswap_32, bswap_64 - reverse order of bytes

SYNOPSIS

       #include <byteswap.h>

       bswap_16(x);
       bswap_32(x);
       bswap_64(x);

DESCRIPTION

       These macros return a value in which the order of the bytes in their 2-, 4-, or 8-byte arguments is reversed.

RETURN VALUE

       These macros return the value of their argument with the bytes reversed.

ERRORS

       These macros always succeed.

CONFORMING TO

       These macros are GNU extensions.

EXAMPLE

       The  program  below  swaps the bytes of the 8-byte integer supplied as its command-line argument.  The following shell session demonstrates
       the use of the program:

	   $ ./a.out 0x0123456789abcdef
	   0x123456789abcdef ==> 0xefcdab8967452301

   Program source

       #include <stdio.h>
       #include <stdint.h>
       #include <stdlib.h>
       #include <inttypes.h>
       #include <byteswap.h>

       int
       main(int argc, char *argv[])
       {
	   uint64_t x;

	   if (argc != 2) {
	       fprintf(stderr, "Usage: %s <num>
", argv[0]);
	       exit(EXIT_FAILURE);
	   }

	   x = strtoul(argv[1], NULL, 0);
	   printf("0x%" PRIx64 " ==> 0x%" PRIx64 "
", x, bswap_64(x));

	   exit(EXIT_SUCCESS);
       }

SEE ALSO

       byteorder(3), endian(3)

Linux								    2019-03-06								  BSWAP(3)

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