Reading length of string from record in file

[TexasKid]

I am writing a program that creates a textfile that stores records. Each record is storing the following structure :

typedef struct Client
{
        char id[10];
        char name[25];
        char surname[25];
        
} Client;

I need to create a function that checks the string length of the 'id' of structure for a given record number RecNum by the user.

If the string length is equal to 0 , it means that the record is available for booking , and the program must return the word 'Free' , else it must return the word 'Taken'.

Can someone help me please?

[cas]

Post the code you've got, and explain where you're stuck.

[claudiu]

Google strcmp() and strlen().

[TexasKid]

I need to know how to access the character string from the file according t the RecNumber inputted by the user , s that I can read the length using strlen().

[claudiu]

You can't access only parts of a file. You have to read it whole, put it in some sensible data structures and then find whatever it is you are looking for in it.