Write a program that processes the command line parameters according to the usag

Question

Write a program that processes the command line parameters according to the usage: transpose2 [-2] [-r] [-p d|x] n. This means the program can accept an optional parameter -2, followed by an optional parameter -r, followed by an optional parameter -p (which must be followed by one of the strings d or x or o), followed by an (non-negative) integer n. Valid examples include:

transpose2 0; transpose2 -2 4; transpose2 -r -p d 5; transpose2 -2 -p d 8; transpose2 -p x 16

The program should print out a `usage' message and exit with a status of 1 if the parameters are invalid. Invalid examples include:

transpose2; transpose2 -t 4; transpose2 -p b 5; transpose2 -2 -p x d; transpose2 -p x

Note that your program may treat as valid or invalid the cases where the -2, -r and -p options are repeated or out of order.

Explanation / Answer

# include

int main(int argc, char *argv[])

{   if (argv[argc] > 0)

{ /* check whether the last value of the command line is an integer */

for ( i=0; i

{ switch (argv[i]) /* use switch to check the value given is in the list provided */

{ case "-2" break;

case "-r" break;

case "-p" break;

case "d" break;

case "x" break;

} /* switch ends */

} /*for ends */

printf( " All the parameters are valid" );

return;

} /* if ends */

else

printf ( "Invalid parameters" );

return(1);

}

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