METAFONT the program by Donald E. Knuth

By Donald E. Knuth

The is the fourth quantity in a five-volume sequence on pcs and Typesetting, all authored through Donald E. Knuth.

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Thus the numerator is positive; and since the tension τ is constrained to be at least 34 , the numerator is less than 16 3 . The denominator is nonnegative and at most 6. Hence the fixed-point calculations below are guaranteed to stay within the bounds of a 32-bit computer word. The angles θ and φ are given implicitly in terms of fraction arguments st , ct , sf , and cf , representing sin θ, cos θ, sin φ, and cos φ, respectively. 22 } if t = unity then num ← make scaled (num , t); { make scaled (fraction , scaled ) = fraction } if num div 4 ≥ denom then velocity ← fraction four else velocity ← make fraction (num , denom ); end; 117.

History ← fatal error stop ; jump out ; end; Put help message on the transcript file 86 ; exit : end; 78. Get user’s advice and return 78 ≡ loop begin continue : clear for error prompt ; prompt input ("? "); if last = first then return; c ← buffer [first ]; if c ≥ "a" then c ← c + "A" − "a"; { convert to uppercase } Interpret code c and return if done 79 ; end This code is used in section 77. 79. It is desirable to provide an ‘E’ option here that gives the user an easy way to return from METAFONT to the system editor, with the offending line ready to be edited.

Let’s consider the one-word memory region first, since it’s the simplest. The pointer variable mem end holds the highest-numbered location of mem that has ever been used. The free locations of mem that occur between hi mem min and mem end , inclusive, are of type two halves , and we write info (p) and link (p) for the lh and rh fields of mem [p] when it is of this type. The single-word free locations form a linked list avail , link (avail ), link (link (avail )), . . terminated by null . lh { the link field of a memory word } { the info field of a memory word } Global variables 13 +≡ avail : pointer ; { head of the list of available one-word nodes } mem end : pointer ; { the last one-word node used in mem } 162.

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