New to C please help nice and easy!!

[hoggmeister]

Hi,

Im new to C coming from a java background. I having difficulty
adjusting to C and was hoping someone could help me with a little
simple code to get started. I would like a little program that outputs
on to the console a message like "please enter some text" then when the
user enters text it gets stored in a char array or whatever is best. I
then want to check that the array is no longer than 25 chars ( i dont
know if malloc is required or not ) and if it is less than 25 it gets
stored in virtual memory if not then it loops and asks for input again.
Just a nice easy one so i can put in debugger to understand how the
code works. Thanks for looking.

[Thomas Matthews]

ho*********@gma il.com wrote:

Hi,

Im new to C coming from a java background. I having difficulty
adjusting to C and was hoping someone could help me with a little
simple code to get started. I would like a little program that outputs
on to the console a message like "please enter some text" then when the
user enters text it gets stored in a char array or whatever is best. I
then want to check that the array is no longer than 25 chars ( i dont
know if malloc is required or not ) and if it is less than 25 it gets
stored in virtual memory if not then it loops and asks for input again.
Just a nice easy one so i can put in debugger to understand how the
code works. Thanks for looking.

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main(void)
{
string data;
static vector<string> virtual_memory;
while (true)
{
cout << "please enter some text";
getline(cin, data);
if (data.length() >= 25)
{
virtual_memory. push_back(data) ;
}
} // End: while true
return 0;
}

--
Thomas Matthews

C++ newsgroup welcome message:
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Other sites:
http://www.josuttis.com -- C++ STL Library book
http://www.sgi.com/tech/stl -- Standard Template Library

[osmium]

"Thomas Matthews" <Th************ *************@s bcglobal.net> wrote in
message news:HQ******** ***********@new ssvr33.news.pro digy.com...

ho*********@gma il.com wrote:

Hi,

Im new to C coming from a java background. I having difficulty
adjusting to C and was hoping someone could help me with a little
simple code to get started. I would like a little program that outputs
on to the console a message like "please enter some text" then when the
user enters text it gets stored in a char array or whatever is best. I
then want to check that the array is no longer than 25 chars ( i dont
know if malloc is required or not ) and if it is less than 25 it gets
stored in virtual memory if not then it loops and asks for input again.
Just a nice easy one so i can put in debugger to understand how the
code works. Thanks for looking.

#include <iostream>

That's not C.

<snip>

[vijay]

# include<stdio.h >

int main()
{
char str[100];
do{
printf("Enter text: \n");
fgets(str,sizeo f(str),stdin);

if(strlen(str)> =25)
continue;
else{
printf("\nThe text is: %s",str);
break;
}
}
while(1);

return 0;
}

[Eric Sosman]

Thomas Matthews wrote:

ho*********@gma il.com wrote:

Hi,

Im new to C coming from a java background. I having difficulty
adjusting to C and was hoping someone could help me with a little
simple code to get started. I would like a little program that outputs
on to the console a message like "please enter some text" then when the
user enters text it gets stored in a char array or whatever is best. I
then want to check that the array is no longer than 25 chars ( i dont
know if malloc is required or not ) and if it is less than 25 it gets
stored in virtual memory if not then it loops and asks for input again.
Just a nice easy one so i can put in debugger to understand how the
code works. Thanks for looking.

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main(void)
{
string data;
static vector<string> virtual_memory;
while (true)
{
cout << "please enter some text";
getline(cin, data);
if (data.length() >= 25)
{
virtual_memory. push_back(data) ;
}
} // End: while true
return 0;
}

I'm having trouble getting this code to work; can
you tell me what's wrong? Here's what the compiler says:

bogus.c:1:20: iostream: No such file or directory (ENOENT)
bogus.c:2:18: string: No such file or directory (ENOENT)
bogus.c:3:18: vector: No such file or directory (ENOENT)
bogus.c:4: parse error before "namespace"
bogus.c:4: warning: type defaults to `int' in declaration of `std'
bogus.c:4: ISO C forbids data definition with no type or storage class
bogus.c: In function `main':
bogus.c:8: `string' undeclared (first use in this function)
bogus.c:8: (Each undeclared identifier is reported only once
bogus.c:8: for each function it appears in.)
bogus.c:8: parse error before "data"
bogus.c:9: warning: ISO C forbids nested functions
bogus.c:9: syntax error before '<' token
bogus.c:10: `true' undeclared (first use in this function)
bogus.c:12: `cout' undeclared (first use in this function)
bogus.c:13: warning: implicit declaration of function `getline'
bogus.c:13: `cin' undeclared (first use in this function)
bogus.c:13: `data' undeclared (first use in this function)
bogus.c:16: `virtual_memory ' undeclared (first use in this function)
bogus.c:18: parse error before '/' token
bogus.c:12: warning: statement with no effect
bogus.c:20: warning: control reaches end of non-void function

(An oddity: The lines of diagnostic messages outnumber
the lines of source code.)

--
Er*********@sun .com

[Eric Sosman]

vijay wrote:

# include<stdio.h >

int main()
{
char str[100];
do{
printf("Enter text: \n");
fgets(str,sizeo f(str),stdin);

if(strlen(str)> =25)
continue;
else{
printf("\nThe text is: %s",str);
break;
}
}
while(1);

return 0;
}

This works (or will, after #include <string.h> is
added), but why make the control flow so baroque?

do {
printf (...);
fgets (...);
} while (strlen(str) >= 25);
printf ("The text is: %s\n", str);

.... seems to express the intent both more clearly and
more succinctly.

Observation: `do { ... } while (1);' is almost
always a mistake. Conjecture: "always" can be deleted
without falsifying the observation.

--
Er*********@sun .com

[Keith Thompson]

Eric Sosman <er*********@su n.com> writes:
[...]

Observation: `do { ... } while (1);' is almost
always a mistake. Conjecture: "always" can be deleted
without falsifying the observation.

Conjecture: You meant that "almost" can be deleted without falsifying
the observation (unless you meant "almost a mistake").

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

[Thomas Matthews]

Thomas Matthews wrote:

ho*********@gma il.com wrote:

Hi,

Im new to C coming from a java background. I having difficulty
adjusting to C and was hoping someone could help me with a little
simple code to get started. I would like a little program that outputs
on to the console a message like "please enter some text" then when the
user enters text it gets stored in a char array or whatever is best. I
then want to check that the array is no longer than 25 chars ( i dont
know if malloc is required or not ) and if it is less than 25 it gets
stored in virtual memory if not then it loops and asks for input again.
Just a nice easy one so i can put in debugger to understand how the
code works. Thanks for looking.

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main(void)
{
string data;
static vector<string> virtual_memory;
while (true)
{
cout << "please enter some text";
getline(cin, data);
if (data.length() >= 25)
{
virtual_memory. push_back(data) ;
}
} // End: while true
return 0;
}

Sorry, brain in wrong gear.
{Having to switch between C, C++, Visual Basic, and
VBScript today. Ouch.}
--
Thomas Matthews

C++ newsgroup welcome message:
http://www.slack.net/~shiva/welcome.txt
C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.l earn.c-c++ faq:
http://www.comeaucomputing.com/learn/faq/
Other sites:
http://www.josuttis.com -- C++ STL Library book
http://www.sgi.com/tech/stl -- Standard Template Library

[Eric Sosman]

Keith Thompson wrote:

Eric Sosman <er*********@su n.com> writes:
[...]

Observation: `do { ... } while (1);' is almost
always a mistake. Conjecture: "always" can be deleted
without falsifying the observation.

Conjecture: You meant that "almost" can be deleted without falsifying
the observation (unless you meant "almost a mistake").

In my own high-falutin' syntax I seem to myself
have uptripped. That'll larn me -- 'cept it probably
won't, alas ...

--
Er*********@sun .com

[hoggmeister]

wow i posted this not so long ago thanks for the response guys