主()
{
int n,t,number = 20
浮點數a=2,b=1,s = 0;
for(n = 1;n & lt=數字;n++)
s = s+a/b;
t = a;a = a+b;b = t;/*這部分是程序的關鍵*/
}
printf("sum是%9.6f\n ",s);