23. What is printed by the following code fragment? int x12, y1, x2 y1 = ++x1;...

   

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23. What is printed by the following code fragment? int x12, y1, x2 y1 = ++x1; y2 = x2++; = 2, y2; std::cout < < x1 < < " " < < x2 < < ' '; std::cout < < y1 < < " < < y2 < < ' '; Why does the output appear as it does? 23. What is printed by the following code fragment? int x12, y1, x2 y1 = ++x1; y2 = x2++; = 2, y2; std::cout < < x1 < < " " < < x2 < < ' '; std::cout < < y1 < < " < < y2 < < ' '; Why does the output appear as it does?