Modify the original memory bitmap

After gaining access to an individual pixel value:

• Listing 3 replaces the original pixel value in the bitmap with the negated value.

Accomplished by:

• Calling the putpixel function
• Negating each color value in the call to the makecol function
• Inside the parameter list of the putpixel function.

When Listing 3 finishes executing:

• Every pixel in the original memory bitmap has been replaced by its negated value.