Simple, direct solution function nextChar(c) { return String.fromCharCode(c.charCodeAt(0) + 1); } nextChar(‘a’); As others have noted, the drawback is it may not handle cases like the letter ‘z’ as expected. But it depends on what you want out of it. The solution above will return ‘{‘ for the character after ‘z’, and this is the … Read more
++x is called preincrement while x++ is called postincrement. int x = 5, y = 5; System.out.println(++x); // outputs 6 System.out.println(x); // outputs 6 System.out.println(y++); // outputs 5 System.out.println(y); // outputs 6
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
UPDATE totals SET total = total + 1 WHERE name=”bill”; If you want to make sure the current value is indeed 203 (and not accidently increase it again) you can also add another condition: UPDATE totals SET total = total + 1 WHERE name=”bill” AND total = 203;
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
Use the += assignment operator: for (var i = 0; i < myVar.length; i += 3) { Technically, you can place any expression you’d like in the final expression of the for loop, but it is typically used to update the counter variable. For more information about each step of the for loop, check out … Read more
See http://ruby-doc.org/core/classes/Range.html#M000695 for the full API. Basically you use the step() method. For example: (10..100).step(10) do |n| # n = 10 # n = 20 # n = 30 # … end
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
Same as in other languages: ++x (pre-increment) means “increment the variable; the value of the expression is the final value” x++ (post-increment) means “remember the original value, then increment the variable; the value of the expression is the original value” Now when used as a standalone statement, they mean the same thing: x++; ++x; The … Read more
No, it doesn’t, see: R Language Definition: Operators