Swift: Unary operator '++' cannot be applied to an operand of type '@lvalue Int'

Swift: Unary operator '++' cannot be applied to an operand of type '@lvalue Int'

Swift error:

Unary operator '++' cannot be applied to an operand of type '@lvalue Int'

Solution:

-- and ++ have been removed from Swift 3.

change to:

var a:Int=0;

a+=1;

print(a)

output:

1

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