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I have worked on the code for 6 hour and finally on checking manually these codes are working fine. I have tried both small and large bmp from 1 to 6. It worked. But same is not working in check50.

Edit(1) : As per xxd code of file from staff solution and mine, there is a deference of $ sign on third line. What s that. i.e Mine : 0000020: 0000 2400 0000 120b 0000 120b 0000 0000 ..$............. and staff's 0000020: 0000 fc00 0000 120b 0000 120b 0000 0000 ................

Edit(2) : Code removed.

And this is the output:

$ check50 2016.resize.less bmp.h resize.c
:) resize.c and bmp.h exist
:) resize.c compiles
:) doesn't resize 1x1-pixel BMP when n is 1
:( resizes 1x1-pixel BMP to 2x2 correctly when n is 2
:( resizes 1x1-pixel BMP to 3x3 correctly when n is 3
:( resizes 1x1-pixel BMP to 4x4 correctly when n is 4
:( resizes 1x1-pixel BMP to 5x5 correctly when n is 5
:( resizes 2x2-pixel BMP to 4x4 correctly when n is 2
[https://sandbox.cs50.net/checks/327868732a9d49e485de821ad6bde3af][1]

enter image description here

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The specification says to determine what header fields need to be updated. There are fields in the headers other than biWidth and biHeight that must be modified when n != 1. I don't see any code to deal with them.

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