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SWIFT

swift print

print("Hello World")
//printing a value
let num = 5
print(num)
print("a num: " + num) //concatenation
print("a num: (num)") //interpolation
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printf in swift

let x = 3.1415926
print(String(format: "%.2f", x)) //3.14

print(String(format: "%2.2f", x)) //  3.14 (two blank spaces in front of 3. 
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