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conversion from ld to bignum

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This commit is contained in:
Zeno Rogue 2019-12-25 11:51:56 +01:00
parent 454024a42c
commit 35f076a171
1 changed files with 10 additions and 0 deletions
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10
util.cpp
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@ -300,6 +300,7 @@ struct bignum {
bignum& operator +=(const bignum& b); bignum& operator +=(const bignum& b);
void addmul(const bignum& b, int factor); void addmul(const bignum& b, int factor);
string get_str(int max_length) const; string get_str(int max_length) const;
bignum(ld d);
bool operator < (const bignum&) const; bool operator < (const bignum&) const;
@ -472,4 +473,13 @@ string bignum::get_str(int max_length) const {
return ret; return ret;
} }
bignum::bignum(ld d) {
if(d == 0) return;
int n = 1;
while(d > BASE) d /= BASE, n++;
digits.resize(n);
n--;
while(n >= 0) { digits[n] = int(d); d -= digits[n]; d *= BASE; n--; }
}
} }