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Is there a difference in ++i and i++ in a for loop? Is it simply a syntax thing?
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The only difference is the order of operations between the increment of the variable and the value the operator returns. So basically ++i returns the value after it is incremented, while i++ return the value before it is incremented. At the end, in both cases the i will have its value incremented.
Both increment the number, but ++i increments the number before the current expression is evaluted, whereas i++ increments the number after the expression is evaluated. To answer the actual question, however, they're essentially identical within the context of typical for loop usage.
As a result, pre-increment is faster than post-increment because post-increment keeps a copy of the previous value where pre-increment directly adds 1 without copying the previous value.
As we said before, the pre-increment and post-increment operators don't affect the semantics and correctness of our loop when we use them to increase its counter.
a++ is known as postfix.
add 1 to a, returns the old value.
++a is known as prefix.
add 1 to a, returns the new value.
C#:
string[] items = {"a","b","c","d"}; int i = 0; foreach (string item in items) { Console.WriteLine(++i); } Console.WriteLine(""); i = 0; foreach (string item in items) { Console.WriteLine(i++); } Output:
1 2 3 4 0 1 2 3 foreach and while loops depend on which increment type you use. With for loops like below it makes no difference as you're not using the return value of i:
for (int i = 0; i < 5; i++) { Console.Write(i);} Console.WriteLine(""); for (int i = 0; i < 5; ++i) { Console.Write(i); } 0 1 2 3 4
0 1 2 3 4
If the value as evaluated is used then the type of increment becomes significant:
int n = 0; for (int i = 0; n < 5; n = i++) { } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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