LINDO用于求解线性规划和二次规划问题，LINGO除了具有LINDO的全部功能外，还可以用于求解非线性规划问题，也可以用于一些线性和非线性方程(组)的求解，等等。-LINDO for solving linear programming and quadratic programming problems, LINDO LINGO addition to the full functionality, but also can be used for nonlinear programming

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Addressbook using double-linked list. This example shows the use of a double-linked list by implementing an addressbook for the console. It has features like inserting, searching(linear), sorting(bubble sort), deleting and load/save to a file. I wrot