2013
12-29

# Fibbonacci Number

Your objective for this question is to develop a program which will generate a fibbonacci number. The fibbonacci function is defined as such:

f(0) = 0
f(1) = 1
f(n) = f(n-1) + f(n-2)

Your program should be able to handle values of n in the range 0 to 50.

Each test case consists of one integer n in a single line where 0≤n≤50. The input is terminated by -1.

Each test case consists of one integer n in a single line where 0≤n≤50. The input is terminated by -1.

3
4
5
-1

2
3
5

HintNote:
you can use 64bit integer: __int64

2011-12-15 00:29:10

mark：注意long long。注意0（不知道有没有）

# include <stdio.h>
# include <math.h>

long long dp[55] = {0, 1} ;

int main ()
{
int i, n ;
for (i = 2 ; i<= 50 ; i++)
dp[i] = dp[i-1]+dp[i-2] ;

while (~scanf ("%d", &n))
{
if (n < 0) break ;
printf ("%I64d\n", dp[n]) ;
}
}