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I wrote the following macro, that prints C_0^*. But I wanted to push the position of * little high, hence used strut. I also wanted optional argument i.e. C^* and C_0^* can be handled by same macro. So, I defined the following:

\documentclass{article} \newcommand{\objstylesf}[1]{\ensuremath{\mathsf{#1}}} \newcommand{\chcpcti}[1][]{ \ifx&#1& \objstylesf{C}\strut^{\hspace{-.8pt}*} \else \objstylesf{C}_{#1}\strut^{\hspace{-5pt}*} \fi } \begin{document} $\chcpcti$ $\chcpcti[0]$ $\chcpcti[1]$ $\chcpcti[\ell+1]$ \end{document}

For first three, it is working fine. However, for the last one, the * is shifted quite a lot. Anything hardcoded (such as -17pt) hampers the others.

Precisely, I need an input length sensitive optional argument macro definition. Can anyone please help me? I would like to keep the strut there. Or some other way of handling the superscript position might also be fine. But I don't like the default superscript position in this case.

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You want rather to raise the asterisk

\documentclass{article} \newcommand{\objstylesf}[1]{\ensuremath{\mathsf{#1}}} \newcommand{\raisedasterisk}{\mathpalette\raiseexponent{*}} \newcommand{\raiseexponent}[2]{\raisebox{.6\height}{$#1#2$}} \newcommand{\chcpcti}[1][]{% \objstylesf{C}_{#1}^{\raisedasterisk} } \begin{document} $\chcpcti$ $\chcpcti[0]$ $\chcpcti[1]$ $\chcpcti[\ell+1]$ \qquad $\mathsf{C}^{*}$ $\mathsf{C}^{*}_{0}$ $\mathsf{C}^{*}_{1}$ $\mathsf{C}^{*}_{\ell+1}$ \end{document}

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