复制代码 代码如下:

#include <stdio.h>

int fac(int x);

int main(void)

{

int n;

scanf("%d", &n);

if (n == 1 || n == 2)

printf("1n");

else if (n == 3)

printf("2n");

else

{

int last = 1;

int sum = 2;

for (int i = 3; i < n; ++i)

{

int temp = sum;

sum = sum + last;

last = temp;

}

printf("循环求出斐波那契序列值:%dn", sum);

}

int sum2 = fac(n);

printf("递归求出斐波那契序列值:%dn", sum2);

return 0;

}

//递归

int fac(int x)

{

static int f[50] = {1,1};

if (x == 1 || x == 2)

return f[x-1];

return f[x-1] == 0 ?

( f[x-1] = fac(x-1) + fac(x-2) ) :

f[x-1] ;

}