Since the statement i++ ends at the ; in your example, it makes no difference whether you use pre- or post-increment. The difference arises when you utilize the result: int j = i++; // i will contain i_old + 1, j will contain the i_old. Vs: int j = ++i; // i and j will … Read more
Updating an entry: A simple increment should do the trick. UPDATE mytable SET logins = logins + 1 WHERE id = 12 Insert new row, or Update if already present: If you would like to update a previously existing row, or insert it if it doesn’t already exist, you can use the REPLACE syntax or … Read more
Python doesn’t support ++, but you can do: number += 1
A full explanation here from Chris Lattner, Swift’s creator. I’ll summarize the points: It’s another function you have to learn while learning Swift Not much shorter than x += 1 Swift is not C. Shouldn’t carry them over just to please C programmers Its main use is in C-style for loop: for i = 0; … Read more
Other people have tackled the functional difference between post and pre increment. As far as being an lvalue is concerned, i++ can’t be assigned to because it doesn’t refer to a variable. It refers to a calculated value. In terms of assignment, both of the following make no sense in the same sort of way: … Read more
This is what I read and could answer your question: “preincrement (++i) adds one to the value of i, then returns i; in contrast, i++ returns i then adds one to it, which in theory results in the creation of a temporary variable storing the value of i before the increment operation was applied”.
They both increment the number. ++i is equivalent to i = i + 1. i++ and ++i are very similar but not exactly the same. 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. int i = 3; int … Read more
Note: Originally I posted C# code in this answer for purposes of illustration, since C# allows you to pass int parameters by reference with the ref keyword. I’ve decided to update it with actual legal Java code using the first MutableInt class I found on Google to sort of approximate what ref does in C#. … Read more
Here’s a detailed explanation which I hope will be helpful. Let’s begin with your program, as it’s the simplest to explain. int main() { char *p = “Hello”; while(*p++) printf(“%c”,*p); return 0; } The first statement: char* p = “Hello”; declares p as a pointer to char. When we say “pointer to a char“, what … Read more
++ is not an operator. It is two + operators. The + operator is the identity operator, which does nothing. (Clarification: the + and – unary operators only work on numbers, but I presume that you wouldn’t expect a hypothetical ++ operator to work on strings.) ++count Parses as +(+count) Which translates to count You … Read more