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Why does this cause a seg fault?

Chillzy

Chillzy

New Coder
According to my IDE (CodeBlocks), this bit of code causes a seg fault. I'm trying to fix this but I don't even know why this causes a seg fault so an explanation would be helpful.

```
unsigned char* pixel_offset = data + (j + width * i) * byte_per_pixel;
unsigned char y = pixel_offset[0];
```
 
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