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extension Int {
   var add: Int {return self + 100 }
   var sub: Int { return self - 10 }
   var mul: Int { return self * 10 }
   var div: Int { return self / 5 }
}
    
let addition = 3.add
print("加法运算后的值：\(addition)")
    
let subtraction = 120.sub
 
 
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Snippet Metadata
Owner	w3xue
Created	3 years ago
Modified	3 years ago
Visibility	Public