swift基础-14-while

while循环
格式:while(循环保持条件){需要执行的语句}
OC:

int i = 0;
int sum = 0;
while (i <= 10) {
    sum = i++;
}

while (i <= 10)
    sum = i++;
NSLog(@"%d", sum);

如果只有一条指令while后面的大括号可以省略

Swift:
0.while后的圆括号可以省略
1.只能以bool作为条件语句
2.如果只有1条指令while后面的大括号不可以省略

var i:Int = 0
var sum:Int = 0
while (i <= 10)
{
    sum = i++
}
print("\(sum)")

var i1:Int = 0
var sum1:Int = 0
while i1 <= 10
{
    sum1 = i1++
}
print("\(sum1)")

do while循环
格式:do while(循环保持条件) {需要执行的语句}
OC:

int i = 0;
int sum = 0;
do {
    sum = i++;
} while (i <= 10);
NSLog(@"%d", sum);

int i = 0;
int sum = 0;
do
    sum = i++;
while (i <= 10);
NSLog(@"%d", sum);

Swift2.0之后变为 repeat while, do用于捕捉异常
0.while后的圆括号可以省略
1.只能以bool作为条件语句
2.如果只有1条指令 do 后面的大括号不可以省略

var i2:Int = 0
var sum2:Int = 0
repeat{
    sum2 = i2++;
}while(i2 <= 10)
print(sum2)

var i3:Int = 0
var sum3:Int = 0
repeat{
    sum3 = i3++;
} while i3 <= 10
print(sum3)