斐波那契数列 前30项的和 与第30项到底是多少啊， 找了一天答案了

前三十项和为：2178308
第三十项为：832040
通过java计算出来的！

#include
using namespace std;
int main() {
cout << "Input n and you get a[n] & s[n]." << endl;
long long a, n, x;
long long s1 = 0;
long long s2 = 2;
while (cin >> n) {
if (n == 1) {
x = 1;
s2 = 1;
}
else if (n == 2) {
x = 1;
s2 = 2;
}
else {
long long m1 = 1;
long long m2 = 1;
for (a = 2; a < n; a++) {
m1 = m2 + m1;
m2 = m1 - m2;
s1 = m1;
s2 = s2 + s1;
}
x = m1;
}
cout << "a[" << n << "]=" << x << endl << "s[" << n << "]=" << s2 << endl << endl;
s2 = 2;
}
return 0;
}

拿好=。=自己写的

#include
fac(int n)
{ long t;
if(n==0||n==1)return 1;
else t=fac(n-1)+fac(n-2);return t;
}
main()
{long n;
printf("Enter n:");
scanf("%d",&n);
printf("%d\n",fac(n));
}
C语言写的