Question: Complete ChangeDensity ( ) to output densityPointer is null. if densityPointer is null. Otherwise, assign densityValue to the variable pointed to by densityPointer. End with

Complete ChangeDensity() to output "densityPointer is null." if densityPointer is null. Otherwise, assign densityValue to the variable pointed to by densityPointer. End with a newline.
Ex: If the input is Y 10.5, then the output is:
Density is 10.5. c++

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