7-27 兔子繁衍问题

#include <stdio.h>

int main(void)
{
    int a, b;
    int t;
    int month;
    int amount;

    scanf("%d", &amount);

    a = 0;
    b = 1;      //初始化，第一个月有一对兔子
    month = 1;
    while (b < amount)
    {
        month++;
        t = a + b;
        a = b;
        b = t;
    }

    printf("%d\n", month);

    return 0;
}