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I have managed to finish but i have some queries regarding how fwrite exactly works. If you are new to pset4, the intention of my code is to fwrite the content of triple n times after i have fread triple. 

for (int k=0; k<n; k++)
{
// write RGB triple to outfile
fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr);
}

Versus

fwrite(&triple, sizeof(RGBTRIPLE), n, outptr);

However, only the former method works. Why so? Any help is appreciated!

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fwrite(&triple, sizeof(RGBTRIPLE), n, outptr);

This means to write n consecutive blocks of data of size sizeof(RGBTRIPLE)starting at &triple, not to write one block n times.

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  • Hi can you give an example that can express that meaning of consecutive blocks?
    – Yan Bo Pei
    Jun 20 '18 at 14:31

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