Thread: Structures, Arrays, Sums...

I was wondering if any one could help, point me in the right direction or offer any advice with my problem. The position within the file of the record is decided by this algorithm

result = data->vehicle_reg[0] - 'A';
/*First letter of the registration minus the int value of A */
position = (result *1000)+ data->vehicle_reg[1,2,3];
/*Result of first part mutiplied by 1000 and with the first
three digits of the registration added*/

So, for example
A122FFF would lead to the result of: 122

Data is a pointer to a structure, (I think) it's declared as below:-

struct car
{
vehicle_reg
etc.
} data;

The 'position' generated is the files position, and where it will be written to, it's a random access file (Txt) and will contain 26000 records in total. The records are added only afte checking that a record does not exsist at the positon generated, if so the program will look for places after, the number...

Indeed...

So, can anyone help?

The algorithm is as follows:

The algortihm will take the integer value of the first character (of the registration), and subtract the integer character of 'A' from it and then multiply the result by 100. The next three digits are added to to give the record number.

For example "A122GFD"

'A' - 'A' = 0;
/*First letter of the registration minus the integer vaule of A*/

(0*1000) + 122 = 122
/*0 is the answer from the first part of algorithm, and the number 123 comes from the first three number of the registraion*/

Starting from
char vehicle_reg[4];

Which contains say
"A123"

Then it's

Code:

result = (vehicle_reg[0] - 'A') * 1000 +  
         (vehicle_reg[1] - '0') * 100 + 
         (vehicle_reg[2] - '0') * 10 + 
         (vehicle_reg[3] - '0') * 1;

Why thank you good Sir....

May you're jelly never fail to set properly...

^--I think you ment jello, jelly doesn't really "set"

Never had jello... Had jelly... it sets in a way... starts as liquid, then gets to that wobbly 'set' phase...

But... If you're going to be so picky...

May you're toast always land butter side up....