what is c++ function

can we use function overloading and default arguments at same time in c++

write a c program to calculate sum of the perfect numbers within a given number of range. using function.

create a function that converts an object into an array containing only the object's keys. examples: let obj = { a: 1, b: 2, c: 3 }

Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in C:\Users\Joalu\Desktop\new.php:3 Stack trace: #0 {main}

Write a function called clean that takes a C++ string as input and removes any characters in the string that are not letters except for space blanks.

Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\facultate\CosCump\product.php:5 Stack trace: #0 {main} thrown in C:\xampp\htdocs\facultate\CosCump\product.php on line 5

Write a function that accepts as input two sets represented as lists and produces at output a list representing the intersection of the two sets. Example: >(union ’(a b c d e f) ’(a c f e x y)) ; Value: (a b c d e f x y)

cv2.error: opencv(4.2.0) c:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:assertion failed) !_src.empty() in function 'cv::cvtcolor'

opencv(4.5.1) c:\users\appveyor\appdata\local\temp\1\pip-req-build-kh7iq4w7\opencv\modules\imgproc\src\resize.cpp:4051: error: (-215:assertion failed) !ssize.empty() in function

opencv(4.4.0) c:\users\appveyor\appdata\local\temp\1\pip-req-build-71670poj\opencv\modules\imgproc\src\color.cpp:182: error: (-215:assertion failed) !_src.empty() in function