i = i * sign; sum = sum + i ; sign = -sign;和 sum = sum + i * sign_数学解答

i = i * sign; sum = sum + i ; sign = -sign;和 sum = sum + i * sign ; sign = -sign;有什么区别

人气：150 ℃　时间：2020-06-25 01:21:48

解答

前者运行后i的值变了,后者运行后i的值没变,其余的无区别.