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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 04ced10e8804
children
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union u {double d;long long ll;};
f(double x, int n){union u v;v.d=x;if(n>=0){v.ll<<=63;}else{v.ll+=1<<-n;v.ll>>=-n;}return v.ll;}