//1，有一对兔子从第三个月后每个月生一对兔子，小兔子长到第三个月后又生一对兔子，问每个月的兔子总数是多少
func rabbitSum(_num:NSInteger){
varf1 =1
varf2 =1
varm =0
ifnum <3{
print(f2)
return
}
for_in3...num {
m = f2
f2 += f1
f1 = m
}
print(f2)
}
//rabbitSum(5)
//2，判断101-200之间的素数
func primeNum(){
varn =false;
foriin101..<200{
forjin2..
ifi % j ==0{
n =true
break
}
}
ifn {
n =false
continue
}
print(i)
}
}
//primeNum()
//3，打印水仙花数
func flowerNum(){
foriin100..<1000{
leta = i /100
letb = i %100/10
letc = i %10
ifa*a*a+b*b*b+c*c*c == i {
print(i)
}
}
}
//flowerNum()
//4，输入字符统计字母数字空格和其他符号的个数
func getStrSum(str:String){
vars ="abc123ABC你Ky好z12漂tty45 亮;'"
varletter =0
varnumber =0
varchinese =0
varspace =0
varother =0
foruniins.unicodeScalars{
ifuni.value>=65&&uni.value<=90||uni.value>=97&&uni.value<=122{
letter +=1
}elseifuni.value>=48&&uni.value<=57{
number +=1
}elseifuni.value>=0x4e00&&uni.value<=0x9fbf{
chinese +=1
}elseifuni==" "{
space +=1
}else{
other +=1
}
}
print("字母:\(letter)")
print("数字:\(number)")
print("汉语:\(chinese)")
print("空格：\(space)")
print("其他：\(other)")
}
//getStrSum(str: "")
//5，小球从100米高空掉下，每次弹回是上一次的一半，第n次多高
func ballFallHeight(time:Int)->Double{
letheight =100.0
varn =1
for_in0..
n = n *2
}
letlastHeight = height /Double(n)
print("第",time,"弹回的高度",lastHeight)
returnlastHeight
}
funcball(time:Int)->Double{
iftime ==0{
return100
}else{
letm = time-1==0?0:ballFallHeight(time: time-1)*2
returnball(time: time-1)+m
}
}
print(ball(time:4))
