What type does the sscanf Modifier

Question

I have come across some legacy code that has the following type of line:

sscanf(szBuff,\"%Fd %Ff %Fd %Ff\"

Has anyone seeen a modifier like Fd or Ff? If so, wha

Answer 1

C says for fscanf functions:

(C99¹, 7.19.6.2p14) The conversion specifiers A, E, F, G, and X are also valid and behave the same as, respectively, a, e, f, g, and x.

So in %Fd, the conversion specification is %F which is equivalent to %f. Note that the d is not part of the conversion specification.

For example (for fprintf functions %F is also the same as %f):

printf("%fd\n", 3.141592);

will print:

3.141592d

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_{1. C89/C90 does not recognize the F conversion specifier. For example, for fscanf the corresponding C90 paragraph in 7.9.6.2 says: The conversion specifiers E, G, and X are also valid and behave the same as, respectively e, g, and x}