#include <stdio.h> int main() { int n; scanf("%d", &n); float a, b, c, i, t = 0; double sum=0; if(n>=1&&n<=10){ a = 1; b = 2; sum=a+b; for(i=1;i<n;i++){ c = a + b; sum += c/b; t = b; b = c; a = t; } } printf("%.6f", sum); return 0; } |
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