I have one example test question by this kind:
So in this ebook (Digital Signal Processing Using MATLAB) as the DSP references and not found C/D block equations on it?
and this c/d search results?
Thanks for your attention.
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C/D is simply a "continuous-to-discrete" time conversion. In other words, sampling! :-) You can use $T$ to sample your continuous time signal $x(t)$ into a discrete time signal $x[n]$. Just replace $t=nT$ in your $x(t)$ equation, to turn it into a discrete time signal $x[n]$. D/C is the opposite operation. I think you can move on from here. Let us know if you can work it out now or if you need further help.