程序中的執行順序為從左到又,運算的級別依次為"()","*","/","+"其中"*"和"/"是同壹級別,順序按左至右,所以,上面的執行順序為:
1+a
1/(1+a)
1+1/(1+a)
1/(1+1/(1=a))
1+1/(1+1/(1+a))
1/(1+1/(1+1/(1+a)))
a-1/(1+1/(1+1/(1+a)))
a*(a-1/(1+1/(1+1/(1+a))))
2+a*(a-1/(1+1/(1+1/(1+a))))