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If you know the size, use the second method. This provides the called function with the memory address of the variable to be amended. When dereferencing a double pointer, we do not get the final object, but what is expected: a pointer that must be dereferenced one more time to retrieve the final value. Dereferencing this (pointer) variable within the called function provides access to the original value. Equivalent PowerShell: ForEach-Object - Loop for each object in the pipeline. How to prove that the supernatural or paranormal doesn't exist? Pointer: A pointer is a variable which contains the address of another variable, i.e., address of the memory location of the variable. // Set of strings std::set<std::string> setOfStr = { "jjj", "khj", "bca", "aaa", "ddd" }; (dmesg.0), Get JavaScript object from array of objects by value of property [duplicate], Python speed testing Time Difference milliseconds. What is a smart pointer and when should I use one? How to read dmesg from previous session? In each case, a node needs to be created. How do I align things in the following tabular environment. gcc generates a warning for each excess initializer, while clang gives only one for the first of the three, otherwise the warnings from gcc (also by default) are a bit less informative, but the same. The most convenient is however to use a pointer to a 1D array and have it point at the first element of the 2D array: (A matter of style, but your order of ROWS and COLS is a bit weird, it is more common to do int[COLS][ROWS] then for(i=0; i