The character of "R" in the word of D3DFMT_R32F will become suffix(small and lower down) as the picture I attach. The result I want is "D3DFMT_R32F" and keep the words, do not change the format.
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D3DFMT_R32F the R will become suffix(small and lower down)
You should be aware of the fact that $...$ switches to in-line mathematical mode and the underscore is reserved for subscript indices in this mode. So you have to use special code for special characters.