Difference between this. and this->
One will compile, one won’t. this is a pointer, and you can’t apply . to a pointer. Use -> to access members of the object it points to.
operators
Why “cat” is not equal to “dog” in Python [duplicate]
Because python compares sequences (i.e. strings you have) sequentially by element values. “c” comes before “d” in Unicode, hence the result. To compare length, use len(a) == len(b) The motivation behind this – having sequential comparison of elements, you can sort sequences in sane way. I.e. sorting list of names alphabetically is just sorted(names_list). And … Read more
which is faster assigning a number to the variable or changing the value of that variable either by adding or subtracting some number?
Supposing the modification of a affect the stack rather than a is only supported by a register : a = 11 is a simple write, and on a lot of CPU the CPU executes the next instruction(s) before the write in memory is finished (under condition of memory access(es) of course) a +=1 need first … Read more
Logic behind sizeof operator [duplicate]
The compiler knows the size of all types, it has to or it would not be able to generate code correctly. This information is used by the sizeof operator. Also note that sizeof is not some function being called at runtime, it’s an operator that is fully evaluated during compilation.
What does the ">>=" operator mean in C#?
Right shift assignment operator: num >>= 1 is the same as num = num >> 1 http://msdn.microsoft.com/en-US/library/23as4533(v=vs.80).aspx
"." or "->" C struct accessor [duplicate]
The -> operator is only syntactical sugar: x->y is the same as (*x).y The parentheses are necessary due to the . operator having higher precedence than the * operator.
Python: Does Python have a ternary conditional operator?
Yes, It was added in version 2.5. The expression syntax is: a if condition else b First condition is evaluated, then exactly one of either a or b is evaluated and returned based on the Boolean value of condition. If condition evaluates to True, then a is evaluated and returned but b is ignored, or … Read more
What is the "–>" operator in C/C++?
–> is not an operator. It is in fact two separate operators, — and >. The conditional’s code decrements x, while returning x‘s original (not decremented) value, and then compares the original value with 0 using the > operator. To better understand, the statement could be written as follows: while( (x–) > 0 )