Use the std::vector::vector(count, value) constructor that accepts an initial size and a default value: If a value other than zero, say 4 for example, was required to be the default then: I should also mention uniform initialization was introduced in C++11, which permits the initialization of vector, and other containers, using {}:
Because a std::vector has no particular feature regarding inserting elements at the front, unlike some other containers. The functionality provided by each container makes sense for that container. You probably should be using a std::deque, which is explicitly good at inserting at the front and back. Check this diagram out.
The scope of a variable is always the block it is inside. For example if you do something like The solution is to define y outside of the if blocks In your program you have to move the definition of y and c out of the if blocks into the higher scope. Your Function then … Read more
Im trying to figure out how to reverse the string temp when I have the string read in binary numbers
I am having trouble rounding a GPA double to 2 decimal places. (ex of a GPA needed to be rounded: 3.67924) I am currently using ceil to round up, but it currently outputs it as a whole number (368) here is what I have right now using the above code with 3.67924 would output 368 … Read more
Consider this code, When this program gets compiled, the compiler may optimize this code, if it finds that the program never ever makes any attempt to change the value of some_int, so it may be tempted to optimize the while loop by changing it from while(some_int == 100) to something which is equivalent to while(true) so that the execution could be fast (since the condition in while loop … Read more
Read it backwards (as driven by Clockwise/Spiral Rule): int* – pointer to int int const * – pointer to const int int * const – const pointer to int int const * const – const pointer to const int Now the first const can be on either side of the type so: const int * == int const * const int * const == int const … Read more
Put the following code before int main(): And you will be able to use cout. For example: Now take a moment and read up on what cout is and what is going on here: http://www.cplusplus.com/reference/iostream/cout/ Further, while its quick to do and it works, this is not exactly a good advice to simply add using namespace std; at the top … Read more
What are undeclared identifier errors? What are common causes and how do I fix them? Example error texts: For the Visual Studio compiler: error C2065: ‘cout’ : undeclared identifier For the GCC compiler: ‘cout’ undeclared (first use in this function)
you can require the user to hit enter before closing the program… something like this works. The cin reads in user input, and the .ignore() function of cin tells the program to just ignore the input. The program will continue once the user hits enter. Link