How can I print out C++ map values?
In C++11, you don’t need to spell out map<string, pair<string,string> >::const_iterator. You can use auto Note the use of cbegin() and cend() functions. Easier still, you can use the range-based for loop:
c++
error C2011: ” : ‘class’ type redefinition
Change to code to something like this: If you include this header file more than once in some source file, include guards will force compiler to generate class only once so it will not give class redefinition error.
Printing the correct number of decimal points with cout
With <iomanip>, you can use std::fixed and std::setprecision Here is an example And you will get output
How to add element to C++ array?
There is no way to do what you say in C++ with plain arrays. The C++ solution for that is by using the STL library that gives you the std::vector. You can use a vector in this way:
C++ Image Processing Libraries
Magick++ might help. It’s the library version of ImageMagick.
Deleting a dynamically allocated 2D array
In reality, an array of pointers pointed to by a pointer is still an array of integral data types or numbers to hold the memory addresses. You should use delete[] for both. Also, yes, a new[] implies a delete[]. When you create an array of arrays, you’re actually creating an array of numbers that happen to hold the memory address for another array … Read more
How to make an array with a dynamic size? General usage of dynamic arrays (maybe pointers too)?
For C++: If you just need a container just use std:vector. It will take care all the memory allocations necessary for you. However if you want to develop your own dynamic container (whatever reasons you have) you have to take care off the memory allocations yourself. That is, when your array grows you have to allocate new … Read more
Reading getline from cin into a stringstream (C++)
You are almost there, the error is most probably1 caused because you are trying to call getline with second parameter stringstream, just make a slight modification and store the data within the std::cin in a string first and then used it to initialize a stringstream, from which you can extract the input: 1. Assuming you have included:
Remove an array element and shift the remaining ones
You just need to overwrite what you’re deleting with the next value in the array, propagate that change, and then keep in mind where the new end is: Now your array is {1, 2, 4, 5, 6, 7, 8, 9, 9}. You cannot delete the extra 9 since this is a statically-sized array, you just have to ignore … Read more
Uninitialised value was created by a stack allocation
The meaning of the error is essentially that you’re using a variable before you assign to it. The only variables this can possibly apply to are dd, mm, yy. This means that your sscanf call is not writing to all three of them. This will occur if you pass in a date that isn’t completely specified. Note that sscanf returns a value … Read more