Binary file and structs

[csstudent123]

Hello. What is the difference between reading from binary file between the following way:

struct aStrct{

   int number;

}vars[];
while(file.good())

    file.read((char*)&vars, sizeof(aStrct))

And

while(file.good())

    file.read((char*)&vars[i], sizeof(aStrct))

    i++;

[LB]

The difference is that one is incorrect, and the other is slightly less incorrect.

[csstudent123]

pls explain which ones? I used the second one in a code and it is working fine