Optionals

//var a:Int=5

//if a>8{
  //  print("value of a is \(a)")
///} else if a<7 {
//    print("value of a is less than 7")
//}

//var b:Int=11

//switch b%2 {
  //  case 10
//    print("value of b is 10")
 //   fallthrough
  //  case 5:
    
//    print("value of b is 11")
    
 //   case 0:
  //  print("value is 0")
    
    //default:
    //print("defualt case")

//}

//var a:Int=7
//var b:Int=8

//var max=a>b?a:b

//var a:[Int]=[10, 20, 30]

//for i in a {
//    print("value of i is \(i)")
//}

//var index=5

//repeat{
//    print("valx=index+1
//}while inue of index is \(index)")
///    indedex<10

//var index=10

//repeat{
//index=index+1
//if index==15
//{
//break
//}
 //print("value of index is \(index)")
//} while index<20

var a=String("hello")

a=a+"hi"
print(a)
if a.isEmpty{
    print("string is empty")
} else{
    print("string has characters")
}

print(a)