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#include <stdio.h>
#define N 20int main()
{double sum=0.0 , a=1, b=2; //a分母，b分子for(int i=1;i<=N;i++){sum+=b/a;b=a+b;a=b-a;}printf("前%d项和为%lf\n",N, sum);return 0;
}
#include <stdio.h>
#define N 20int main()
{double sum=0.0 , a=1, b=2; //a分母，b分子for(int i=1;i<=N;i++){sum+=b/a;b=a+b;a=b-a;}printf("前%d项和为%lf\n",N, sum);return 0;
}