public class test { public static void main(String[] args) { double sum = 0; double z = 2; double m = 1; for(int i = 1 ;i <= 2 ; i++) { sum = sum + z/m;// sum = 0 + 2/1 sum = 2 for 2(循环第二次): sum = 2 + 4/2 sum = 4 m = z; // m = 2 for 2: m = 4 z = z + m; // z = 2 + 2 z = 4 for 2: z = 4 + 4 z = 8 } System.out.println("sum="+sum); //sum = 4.0 } } 结果就是4啊,你想得到什么结果?
{
public static void main(String[] args)
{
double sum = 0;
double z = 2;
double m = 1; for(int i = 1 ;i <= 2 ; i++)
{
sum = sum + z/m;// sum = 0 + 2/1 sum = 2 for 2(循环第二次): sum = 2 + 4/2 sum = 4
m = z; // m = 2 for 2: m = 4
z = z + m; // z = 2 + 2 z = 4 for 2: z = 4 + 4 z = 8
}
System.out.println("sum="+sum); //sum = 4.0
}
}
结果就是4啊,你想得到什么结果?