How to declare a variable.

  Using variable in program :-

                                                      #include <iostream>
                                                      using namespace std;
                                                      int main ( )
                                                    {
                                                       int all_1;
                                                       all_1 = 22;
                                                       cout << all_1;
                                                       return 0;
                                                     }

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