Data from a file to an array and opposite

Aloha! Hope you can help me on this one!
I need to read from a text (sequencial) file into an array, work on it and then save it to the origin file. How do I do this? I can only get examples of string->file file->string
Thanx in advance! :))

Hum...what I need to do is take one file and read some of it's lines into the first position of the array; and so on for the next positions. Here are the first 2 sets of lines of the file:
They represent students, wich I need to load into a CardType type array:
11
Albert Einstein
100
2
B
234
120
45
2002 11 18 //date
8 0 0 //time
2002 11 15 //date
16 20 0 //time
Stephen Jay Gould
235
3
A
512
100
50
2002 11 18 //date
8 20 0 //time
2002 11 18 //date
12 30 0 //time

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