- What does a++ mean in C? - Stack Overflow
5 a++ is post-incrementing a That is, the value of a is copied before it is returned and then it is incremented As I mentioned in the comments, I get a different result to you, for the reason I explain below If you add printf("%d\n", a);, after your last call to printf() you'll see 2 because a has now been incremented
- c++ - What is the difference between ++ and += 1 operators . . .
@leftaroundabout: Integers and iterators have nothing to do with one another We aren't talking about pointers here (and the proper generalization of i += 1 would be std::advance (i, 1)), and the OP seems not yet knowledgeable enough to complicate matters in such a way I stand by my point: the only difference between i += 1 and ++i for integers (which is what is asked about) is a cosmetic one
- c - What is the difference between ++i and i++? - Stack Overflow
In C, what is the difference between using ++i and i++, and which should be used in the incrementation block of a for loop?
- What is the difference between a += b and a =+ b , also a++ and ++a?
a++ is postfix increment and ++a is prefix increment They do not differ when used in a standalone statement, however their evaluation result differs: a++ returns the value of a before incrementing, while ++a after
- Incrementing in C++ - When to use x++ or ++x? - Stack Overflow
This may seem like pedantry (mainly because it is :) ) but in C++, x++ is a rvalue with the value of x before increment, x++ is an lvalue with the value of x after an increment Neither expression guarantees when the actual incremented value is stored back to x, it is only guaranteed that it happens before the next sequence point 'after processing the current statement' is not strictly
- Difference between pre-increment and post-increment in a loop?
In other languages such as C# where the ++ operator can't be overloaded there is no performance difference Used in a loop to advance the loop variable, the pre and post increment operators are equivalent Correction: overloading ++ in C# is allowed It seems though, that compared to C++, in C# you cannot overload the pre and post versions independently So, I would assume that if the result
- c++ - rate ++a,a++,a=a+1 and a+=1 in terms of execution efficiency in C . . .
But by a very high chance the expected answer is that a++ is the fastest one and a=a+1 the slowest, since ancient compilers relied on the user to perform such optimizations In C++ it depends of the type of a When a is a numeric type, it acts the same way as in C, which means a++, a+=1 and a=a+1 generate the same code
- c++ - What does the operation c=a+++b mean? - Stack Overflow
The C and C++ languages do not specify at what time the increment is computed relative to the addition It would be perfectly legal for this to be computed as "temp = a++", and then "temp + b", computing the addition of "a + b" after the increment
|