斐波那契数列代码

include <stdio.h>

int main (void)
{
int a;
int f1 = 1,f2 = 1,f3;
int i;
scanf("%d",&a);//输入的a有取值范围
if ((a == 1)||(a == 2))
{
printf(“1\n”);
}
else if ((a>1)&&(a<=40))
{
for (i = 3;i<=a;++i)
{
f3=f2+f1;
f1=f2;
f2=f3;
}
printf("%d\n",f2);
}

return 0;

}