swift循环

遍历数组
        var secondForLoop=0;
        for var i=0;i<3;++i{
            secondForLoop+=1;
        }
        println(secondForLoop);

for 循环遍历最大值

let interestingNumbers=[
            "prime":[3,5,3,65,33],
            "fibonacci":[1,1,5,3,3],
            "square":[1,4,2,76,43]
        ];
        var largest=0;
        for(kind,numbers)in interestingNumbers{
            for number in numbers{
            if number>largest{
                largest=number;
            }
            }
        }
        println(largest);
while循环
var n=2;
        while n<100{
            n=n*2;
        }
        println(n);

do-while循环
        var m=2;
        do{
        m=m*2;
        
        }while m<100;
        println(m);

...使用
        var firstForLoop=0;
        for i in 0...100{
            firstForLoop+=i;
        }
        println(firstForLoop);