s9155773

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_file, "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(char 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.txt"); /* 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): ");
}

}

Pizentios

You should really use the code tags.

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Check out my Blog <---updated Nov 30 2007!

Ooble

T'would be handy. And also, you didn't need to mail me this - I check here every day. Sorry I can't help.

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kurifu

Why won't it compile?

__________________
Clifford Matthew Roche &lt;geek@cliffordroche.com&gt;
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Pizentios

I have a feeling that this is a homework assignment.

__________________
Profanity is the one language that all programmers understand.

Check out my Blog <---updated Nov 30 2007!