#include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { int n,i; double sum=0,a=1,b=2,c; scanf("%d",&n); if(n>=1&&n<=10) { for(i=1;i<=n;i++) { sum+=b/a; c=a; a=b; b=c+b; } printf("%.6lf",sum); } return 0; } |
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