What is the rationale for fread/fwrite taking size and count as arguments?

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The difference in fread(buf, 1000, 1, stream) and fread(buf, 1, 1000, stream) is, that in the first case you get only one chunk of 1000 bytes or nothing, if the file is smaller and in the second case you get everything in the file less than and up to 1000 bytes.

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