Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
First, create a "hello world" program that prints "Hello World". But NOW, instead use argc to verify that a parameter was given, use argv[1] to display the command line argument back to the user after displaying "Hello". For instance, if I type
./helloWorld Michael
I will see
-----> Hello Michael
2. Relevant commands, code, scripts, algorithms:
We are first asked to create a "hello world" program that simply prints "Hello World"
I typed what was given to me from the assignment:
Code:
#include <stdio.h>
int main (int argc, char *argv[])
{
char *message = "Hello World!";
printf("%s\n, message);
return 0;
}
3. The attempts at a solution (include all code and scripts):
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Western Illinois University(WIU), Macomb(Illinois), USA, Justin EHRLICH, CS410(https://westernonline.wiu.edu/d2l/home/58052)
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
I'm pretty stuck. It's not giving me the right output and I don't have any experience using C++. Been trying to modify it all day and can't get any help. I'd appreciate any help at all.
I searched on the forums. No advises.
I am using a previous source code. I changed the main function main(int argc, char **argv) in a function misc(int argc, char **argv). How do you use the argc and argv parameters? This is how I am calling the function :
char param;
strcat(param,"wgrib ");... (4 Replies)
Is it possible to use the dbx debugger with the CL options for the executable ?
Say you have created a executable called myfunc which can take string arguments at run-time. You run it like this
./myfunc Hello World
where Hello and World are the string arguments
My question is whether... (1 Reply)
Hi C experts,
I have the following code for adding command line option for a program
int main (argc, argv)
int argc;
char *argv;
{
char *mem_type; //memory type
char *name; //name of the memory
int addr; //address bits
int data; ... (5 Replies)
Hello All,
First post. I've been struggling with the following:
Given a char* string, I need to construct an "int argc, char *argv" style structure. What I'm struggling with most is handling escaped-whitespace and quotes.
e.g. the string:
char *s = "hello world 'my name is simon'... (10 Replies)
when i run my program, i have a parameter, that i want to set the value to another string
i am using
int main(int argc, char **argv) {
char my_str=argv;
printf("%s",my_str);
return 0;
}
and i get
Segmentation fault
ran using
./my_prog /usr/share/dict/words hello1
... (2 Replies)
Hi Folks,
I've prepared a shell script that takes action based on arguments and number of arguments..sample code like:
ARGV=("$@")
ARGC=("$#")
case ${ARGV} in
abc)
if ; then
......
else
printf "\nInvalid number of arguments, please check the inputs and... (2 Replies)
Hi guys,
i'm trying to solve this problem.
I have to run something like
cat file1.txt | awk -f script.awk 10
if i'm in the awk script, how can i take the parameter :10 ??:wall:
i try something like :
BEGIN{
var=argv
}
{..}
END{..}
but obviously is not correct... (5 Replies)
All of my machines (various open source derivatives on x86 and amd64) store argv above the stack (at a higher memory address). I am curious to learn if any systems store argv below the stack (at a lower memory address).
I am particularly interested in proprietary Unices, such as Solaris, HP-UX,... (9 Replies)
So i am trying to read in file
readFile <GivenFile> modFile
looking for a regular file under the directories in the GivenFile and print them out is my over all goal.
basically I am looking for anything that looks like a directory in the given file and printing it out.
Since I am trying to do... (2 Replies)
Discussion started by: squidGreen
2 Replies
LEARN ABOUT PLAN9
getflags
GETFLAGS(9.2) GETFLAGS(9.2)
NAME
getflags, usage - process flag arguments in argv
SYNOPSIS
#include <libg.h>
#include <fb.h>
int getflags(int argc, char *argv[], char *flags)
int usage(char *tail)
extern char **flag[], cmdline[], *cmdname, *flagset[];
DESCRIPTION
Getflags digests an argument vector argv, finding flag arguments listed in flags. Flags is a string of flag letters. A letter followed by
a colon and a number is expected to have the given number of parameters. A flag argument starts with `-' and is followed by any number of
flag letters. A flag with one or more parameters must be the last flag in an argument. If any characters follow it, they are the flag's
first parameter. Otherwise the following argument is the first parameter. Subsequent parameters are taken from subsequent arguments.
The global array flag is set to point to an array of parameters for each flag found. Thus, if flag -x was seen, flag['x'] is non-zero, and
flag['x'][i] is the flag's ith parameter. If flag -x has no parameters flag['x']==flagset. Flags not found are marked with a zero. Flags
and their parameters are deleted from argv. Getflags returns the adjusted argument count.
Getflags stops scanning for flags upon encountering a non-flag argument, or the argument --, which is deleted.
Getflags places a pointer to argv[0] in the external variable cmdname. It also concatenates the original members of argv, separated by
spaces, and places the result in the external array cmdline.
Usage constructs a usage message, prints it on the standard error file, and exits with status 1. The command name printed is argv[0].
Appropriate flag usage syntax is generated from flags. As an aid, explanatory information about flag parameters may be included in flags
in square brackets as in the example. Tail is printed at the end of the message. If getflags encountered an error, usage tries to indi-
cate the cause.
EXAMPLES
main(int argc, char *argv[]){
if((argc=getflags(argc, argv, "vinclbhse:1[expr]", 1))==-1)
usage("[file ...]");
}
might print:
Illegal flag -u
Usage: grep [-vinclbhs] [-e expr] [file ...]
SOURCE
/sys/src/libfb/getflags.c
SEE ALSO ARG(2)DIAGNOSTICS
Getflags returns -1 on error: a syntax error in flags, setting a flag more than once, setting a flag not mentioned in flags, or running out
of arguments while collecting a flag's parameters.
GETFLAGS(9.2)
09-12-2014
