that depends types
for exemple string[255] is an array of 256 char, a string type always contains a 0 terminal, so if your string is 50 long, theres one 0 after, and 205 char of random memory. when you read your record in a file, you obtain the original string just because there's a trailing 0.
for an integer type, the size of an integer is fixed and know by advance, that's why you can write stream.write(i, sizeof(integer))
i don't know if i'm understable...
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