Count the frequency

[rccf6178]

Hi all,

Do anyone know how to write a C program to count the frequency of a
certain key pattern in a given datafile?

Input:
• Three alpha-numeric keys separated by space
• A data file contains M by 3 matrix of alpha-numeric keys. Where M is
number of rows and 3 is number of columns.

Output:
• Number of occurrences of the input keys

Example:

Input file db.txt and its content:

4 7 9
2 1 G
5 3 4
A 3 E
1 A 3
F 5 6
X 0 4
Sample run #1
Please enter 3 keys (separated by space):7 A 4

The key ‘7 ‘ has 1 occurrence in the database
The key ‘A’ has 2 occurrences in the database
The key ‘4’ has 3 occurrences in the database

Sample run #2
Please enter 3 keys (separated by space): A B C

The key ‘A’ has 1 occurrence in the database
The key ‘B’ has zero occurrence in the database
The key ‘C’ has zero occurrence in the database

The following is the hints that I have. However, I do not know how I can
complete the program. Your help will be appreciated.

*************** ************

#include <stdio.h>
#include <string.h>
int numeric[10];
int alpha[26];
void ReadData(char* input_file)
{
FILE* fptr;
char buffer[128];
char* token;
int index;

fptr = fopen(input_fil e, "r");

if (fptr != NULL)
{
while (fgets(buffer, sizeof(buffer), fptr) != NULL)
{
token = strtok(buffer, " ");
while ( token != NULL )
{

if (token[0] >= '0' && token[0] <= '9')
{
/* calculate number of input in numeric[] */
}
else if (token[0] >= 'A' && token[0] <= 'Z')
{
/* calculate number of input in alpha[] */
}

/* Get next token: */
token = strtok( NULL, " " );
}
}
}
}
/* get the occurrence of the specified key */
int GetKeyCount(cha r key)
{
int index;

if (key >= '0' && key <= '9')
{
….. /* return the occurrence of the numeric input key in numeric[] */
}
else if (key >= 'A' && key <= 'Z')
{
….. /* return the occurrence of the alpha input key in alpha[] */
}
else
return 0; /* return 0, if the key is not defined */

}

void main()
{
char enquiry[32]; /* store the enquiry string input by user */
char* token;

ReadData("db.tx t"); /* setup the key occurrence database from the input
file */

printf("Please enter 3 keys (separated by space): ");

while (gets(enquiry) != NULL)
{

token = strtok(enquiry, " "); /* get the key one by one from the line
delimited by a space - e.g. "1 2 A" */

while (token != NULL )
{
/* While there are tokens in "string" */

/* print out the result from the key token[0] and the function
GetKeyCount() */
……..
/* Get next token: */
…….
}

printf("Please enter 3 keys (separated by space): ");
}

}

[dandelion]

"rccf6178" <rc******@yahoo .com.hk> wrote in message
news:7a******** *************** *******@localho st.talkaboutpro gramming.com...

Hi all,

Do anyone know how to write a C program to count the frequency of a
certain key pattern in a given datafile?

Make your own homework...

[Mark A. Odell]

"dandelion" <da*******@mead ow.net> wrote in
news:41******** *************** @dreader9.news. xs4all.nl:

Do anyone know how to write a C program to count the frequency of a
certain key pattern in a given datafile?

Make your own homework...

^^^^
Do

--
- Mark ->
--

[dandelion]

"Mark A. Odell" <od*******@hotm ail.com> wrote in message
news:Xn******** *************** *********@130.1 33.1.4...

"dandelion" <da*******@mead ow.net> wrote in
news:41******** *************** @dreader9.news. xs4all.nl:

Do anyone know how to write a C program to count the frequency of a
certain key pattern in a given datafile?
Make your own homework...

^^^^
Do

When your dutch/german/french/latin is as good as mine, it's time to start
correcting me.
--
- Mark ->
--

[Richard Bos]

"dandelion" <da*******@mead ow.net> wrote:

"Mark A. Odell" <od*******@hotm ail.com> wrote in message
news:Xn******** *************** *********@130.1 33.1.4...

"dandelion" <da*******@mead ow.net> wrote in
news:41******** *************** @dreader9.news. xs4all.nl:

Make your own homework...

^^^^
Do

When your dutch/german/french/latin is as good as mine, it's time to start
correcting me.

Vind ik best. Het is "_Do_ your own homework", du ungeheurer Idiot,
nicht "Make your own homework". Nunc tace.

Richard

[Joona I Palaste]

Richard Bos <rl*@hoekstra-uitgeverij.nl> scribbled the following:

"dandelion" <da*******@mead ow.net> wrote:

"Mark A. Odell" <od*******@hotm ail.com> wrote in message
news:Xn******** *************** *********@130.1 33.1.4...

> "dandelion" <da*******@mead ow.net> wrote in
> news:41******** *************** @dreader9.news. xs4all.nl:
>
> > Make your own homework...
> ^^^^
> Do
When your dutch/german/french/latin is as good as mine, it's time to start
correcting me.

Vind ik best. Het is "_Do_ your own homework", du ungeheurer Idiot,
nicht "Make your own homework". Nunc tace.

Mais Richard, tu as oublie le Français...

--
/-- Joona Palaste (pa*****@cc.hel sinki.fi) ------------- Finland --------\
\-------------------------------------------------------- rules! --------/
"The question of copying music from the Internet is like a two-barreled sword."
- Finnish rap artist Ezkimo

[dandelion]

"Richard Bos" <rl*@hoekstra-uitgeverij.nl> wrote in message

Vind ik best. Het is "_Do_ your own homework", du ungeheurer Idiot,
nicht "Make your own homework". Nunc tace.

<plonk>

[Joona I Palaste]

dandelion <da*******@mead ow.net> scribbled the following:

"Richard Bos" <rl*@hoekstra-uitgeverij.nl> wrote in message

Vind ik best. Het is "_Do_ your own homework", du ungeheurer Idiot,
nicht "Make your own homework". Nunc tace.

<plonk>

<plonk>

--
/-- Joona Palaste (pa*****@cc.hel sinki.fi) ------------- Finland --------\
\-------------------------------------------------------- rules! --------/
"A computer program does what you tell it to do, not what you want it to do."
- Anon

[dandelion]

"Joona I Palaste" <pa*****@cc.hel sinki.fi> wrote in message
news:cm******** **@oravannahka. helsinki.fi...

<shrug>

[Mark A. Odell]

"dandelion" <da*******@mead ow.net> wrote in
news:41******** *************** @dreader14.news .xs4all.nl:

>> Do anyone know how to write a C program to count the frequency of a
>> certain key pattern in a given datafile?
>
> Make your own homework...

^^^^
Do

When your dutch/german/french/latin is as good as mine, it's time to
start correcting me.

When I start writing in any of those languages, I will *welcome* your
corrections. How else will I learn?

--
- Mark ->
--