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Shortly after posting, I noticed an obvious improvement to my C++ solution. If I'm going to use a table, I might as well eliminate the toupper() call by mapping the lower case letters also. Also, increasing the table size to 256 eliminates any possible nasty memory faults if passed an invalid roman letter, while further guaranteeing that zero will be returned in that case.

```// Note: there are less than 256 initializers in this table;
// the uninitialized ones are guaranteed by ANSI C to be
// initialized to zero.
const int romtab[256] = {
0,0,0,0,0,0,   0,   0,   0,   0,  //  00- 09
0,0,0,0,0,0,   0,   0,   0,   0,  //  10- 19
0,0,0,0,0,0,   0,   0,   0,   0,  //  20- 29
0,0,0,0,0,0,   0,   0,   0,   0,  //  30- 39
0,0,0,0,0,0,   0,   0,   0,   0,  //  40- 49
0,0,0,0,0,0,   0,   0,   0,   0,  //  50- 59
0,0,0,0,0,0,   0, 100, 500,   0,  //  60- 69
0,0,0,1,0,0,  50,1000,   0,   0,  //  70- 79
0,0,0,0,0,0,   5,   0,  10,   0,  //  80- 89
0,0,0,0,0,0,   0,   0,   0, 100,  //  90- 99
500,0,0,0,0,1,   0,   0,  50,1000,  // 100-109
0,0,0,0,0,0,   0,   0,   5,   0,  // 110-119
10,0,0,0,0,0,   0,   0,   0,   0   // 120-129
};

// Return the arabic number for a roman letter c.
// Return zero if the roman letter c is invalid.
inline int urtoa(int c)
{
return romtab[c];
}

inline int accfn(int t, char c)
{
return t+urtoa(c)-t%urtoa(c)*2;
}

In reply to Re: Rosetta PGA-TRAM by eyepopslikeamosquito
in thread Rosetta PGA-TRAM by eyepopslikeamosquito

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 [Corion]: We-ird - I hadn't known this, but Ingress and Pokemon Go (both AR games in the real world where you run around) switched from using Google Maps to OpenStreetMaps, which is great. But I wonder why, as Ingress is (was?) owned by Google/Alphabet. But ... [Corion]: ... maybe not wholly owned, or the load on Google Maps was too high?! [choroba]: https://metacpan. org/author/ SIMBABQUE might know. He's a heavy Ingress player.

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