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HLSL Transfer a single float to PS?

I am working on Frank Luna's DirectX 9.0c: A Shader Approach program, and I am stuck in Exercise 2 in Chapter 10. I have to calculate the float s value and pass it to the pixel shader so that I can calculate the "tone lighting". I understand the theory of how calculations work, but I cannot figure out how to pass a single float value from my vertex shader to a pixel shader. When I searched on MSDN, I found only semantics that allowed me to skip 3d vectors, etc.

It seems like I might need to somehow modify the input and output structure, but the exercises so far have not had any structures other than the "outputVS" structure.

In short, how do I transfer a single float value from my vertex shader to a pixel shader in HLSL?

Thanks in advance.

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You put a float in one component of the vector. Then your pixel shader reads only one component.

There is no law that states that each component of a vector must contain factual data;)

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