#include<stdio.h> int main() { double fenzi=1.0,fenmu=1.0,fenshu,temp,sum=0.0; int n; scanf("%d",&n); while (n>0) { temp = fenzi; fenzi = fenzi + fenmu; fenmu = temp; fenshu =fenzi/fenmu; sum += fenshu; n--; } printf("%.2f",sum); return 0; } |
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