Updating a file random


08-Jan-2020 04:26

static int update_record(int id, char* new_name) so use this of course.

However you should check for the case that the stuff is not in the file and act accordingly.

The update function should then update the name field of the record. You have to change it to something like a linear search if you do.

In the update function, I'd like to have the user enter an id Number of a tool and then have them enter a name which corresponds to the id number. I'd suggest you structure you code a bit different. But even if we assume that you just use fread, fwrite and the like then ask yourself what happens if you have Tool t1 = {5,12,123.0,"Some name") Tool t2= {100, 1,1234.0, "Some other name"); How can fseek work that way.

Griffith (406003213) // March 24th 2007 #include typedef struct Tool; void transfer(); void update(); void check(); int main()//serves as menu void transfer() //end transfer function void check() //end check function void update() fclose(nd Ptr); }//end transfer function It's quite a weak assumption that you just can fread and fseek in a file and access the proper data. Howerver you invokue undefined behaviour also with fflush(stdin). Or you use some other way of indexing e.g with something like [231] /* id of the record quantity=12 cost=123.12 name="Some name" Or you use for something like Berkeley DB also ( or how about using an embedded SQL library like sqlite?

updating a file random-75

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100 is the maximum number of records, 4 is the number of used records. You can search the index records for a given id and calulate record number and position.

Doing so, the update function could work the same way.

Note, the max number of records can be calculated by dividing the file size by the record size.

One even can think about the "one entry- one exit" control flow in C.

I know C makes it easy to just "jump" out if something goes wrong.But that means there are so many control flows possiblities in one function that it's unbelievable difficult to "get them all" You have to do more test in a functiion but at least you have steady flow from the beginning of some function to it's end.



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