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using namespace std;
struct units {
double y;
vector<char> a;
units(int x) { y = log(x); }
void add(char x) { a.push_back(x); }
pair<int, char> get(int x) {
int i (log(x) / y);
return {i, a[i - 1]};
}
};
units u {1'000};
for (char x : "kMGT") u.add(x);
pair p {u.get(a)};
a /= pow(1'000, p.first);
char x {p.second};
enum SI {
k("kilo"),
M("mega"),
G("giga"),
T("tera");
String s;
static double y = log(1_000);
SI(String s) { this.s = s; }
static SI get(double x) {
int y = (int) (log(x) / SI.y);
return values()[y - 1];
}
}
SI si = SI.get(a);
a /= pow(1_000, si.ordinal() + 1);
String x = si.name();
function GetSIPrefix(AValue: Double): string;
const
SIPrefixes: array[1..24] of String = ('Q','R','Y', 'Z','E','P','T','G','M','K','H','D','','d','c','m','ยต','mc','n','p','f','a','z','y');
SIFactors: array[1..24] of Double = (1E+30,1E+27,1E+24, 1E+21, 1E+18, 1E+15, 1E+12, 1E+9, 1E+6, 1E+3,1E+2,1E+1,1,1E-1,1E-2,
var
i: Integer;
begin
Result := '';
for i := 1 to 24 do
begin
if (Abs(AValue) >= SIFactors[i]) then
begin
Exit(SIPrefixes[i]);
end;
end;
end;
m = {f'{a / 1e12} T': a > 999_999_999_999,
f'{a / 1e9} G': a > 999_999_999,
f'{a / 1e6} M': a > 999_999,
f'{a / 1e3} k': a > 999,
f'{a} ': ...}
s = next(k for k, v in m.items() if v)
x = case a
when 1e3... 1e6 ; "k"
when 1e6... 1e9 ; "M"
when 1e9... 1e12; "G"
when 1e12...1e15; "T"
else ""
end