public?class?Main?{
????public?static?void?main(String[]?args)?throws?Exception?{
????????double?total?=?0;
????????for?(int?i?=?1;?i?<=?99;?i+=2)?{
????????????total?+=?1f?/?i;//1可以看成是1/1
????????}
????????System.out.println("total?=?"+total);
????}
}

結(jié)果：total = 2.9377748798578978

	int?i?=?1;
			float?sum?=?0;
			while(i<=99){
				sum?=?sum+(1f/i);
				i=i+2;
			}