While loop not working in program with boolean (C++) -


hi writing simple program asks user input within range. used boolean start while loop, when try declaring boolean false in first if statement, doesn't end loop , program keeps asking user input. i've thought using break shouldn't negating condition stop loop? 

    int num;      cout << "enter number";     bool invnum= true;     while (invnum = true)     {         cin >> num;          if (num >= 0 && num <= 20)         {             cout << "you typed: " << num << endl;             invnum = false;             //break;         }          if (num <= 0 || num >= 20)         {             cout << "type number: ";         }     }      return exit_success; }

= not used comparison. should use ==. change while (invnum = true) while (invnum == true) or better write while (true == invnum)


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