The use of println
and print
in Swift both print to the console. But the only difference between them seems to be that println
returns to the next line whereas print
will not.
For example:
println("hello world")
println("another world")
will output the following two lines:
hello world
another world
while:
print("hello")
print("world")
outputs only one line:
helloworld
The print
seems to be more like the traditional printf
in C. The Swift documentation states that println
is the equivalent to NSLog
but what's the purpose of print
, is there any reason to use it other than not returning to the next line?
In the new swift 2, the println has been renamed to print which as an option "terminator" argument.
(udpated 2015-09-16 with the new terminator: "")
var fruits = ["banana","orange","cherry"]
// #1
for f in fruits{
print(f)
}
// #2
for f in fruits{
print("\(f) ", terminator: "")
}
#1 will print
banana
orange
cherry
#2 will print
banana orange cherry
That's exactly what it is, it's used when you want to print multiple things on the same line.
Exactly like you said, to print without adding a new line. There are some cases where you may want this. This is a simple example:
var arr = [1,2,3,4,5]
print("My array contains: ")
for num in arr{
print("\(num) ")
}
It is same as in Java print is just print where ln in println means "Next Line". It will create a next line for you.
The deference between print and println is that after print prints the cursor does not skip lines and after println prints the cursor skips a line
来源:https://stackoverflow.com/questions/24072775/difference-between-println-and-print-in-swift