• C

Reading a File

I have files in the following format:

Basket 1:
    Field1=xxxx
    Field2=xxx
    Field3=xxx
Basket 2:
    Field1=xxxx
    Field2=xxx
    Field3=xxx
Basket 3:
    Field1=xxxx
    Field2=xxx
    Field3=xxx
Basket 4:
    Field1=xxxx
    Field2=xxx
    Field3=xxx
...........and so on

No of baskets varies in each file.But the no. of fields are same in each basket.

My aim is:
Based on the Field1 value in each basket I want perform some
operations on Field2 and Field3 values and write the output to some other file.

Can somebody help, how to start.any sample code will be more helpful.
anilkumarvAsked:
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alexoConnect With a Mentor Commented:
#include <stdio.h>

#define FORMAT "Basket %d: Field1=%d Field2=%d Field3=%d\n"
#define FIELDS 4

void main()
{
    FILE *f;
    int n, a, b, c;

    f = fopen("d:/temp/qq.txt", "r");
    while (fscanf(f, FORMAT, &n, &a, &b, &c) == FIELDS)
    {
        printf("%d: %d %d %d\n", n, a, b, c);
    }

    fclose(f);
}
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Answers2000Commented:
The basic approach is

(a) Read the file into a buffer using fopen, fread, fclose
(b) parse the buffer into an internal data structure (say an array in C, or map/multimap in C++ - easier with C++).  Use strchr or similar to break on new lines, colons, equals or other significant characters.
(c) Modify internal data structure
(d) Write out internal data structure using fopen, fwrite, fclose

Which part of the above do you need help on - or all of em ?
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anilkumarvAuthor Commented:
Mainly i need help in parsing.

thanx
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RONSLOWCommented:
use strtok to split up input lines
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laeuchliCommented:
I would put it in an ini file and use the windows ini file reading functions to read it. They are very easy to use.


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anilkumarvAuthor Commented:
I am on unix not on windows.


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