有一个分数序列：2/1, 3/2, 5/3, 8/5, 13/8, …编写程序求出这个序列的前n项之和

#include <stdio.h>

main() {
double denom[10]={2,3},num[10]={1,2};
int n,i;
double result = denom[0] / num[0];
printf("please enter the number n:");
scanf("%d",&n);
getchar();
for(i=1;i < n;i++){
if(n > 10){
printf("Out of arrange!");
getchar();
exit(0);
}
if(i >= 2){
denom[i] = denom[i-1] + denom[i-2];
num[i] = num[i-1] + num[i-2];
}
result = result + denom[i] / num[i];
};
printf("The summation of %d in the array is %f\n",n,result);
getchar();
}