From: pozzugno@gmail.com   
      
    From here[1]:   
      
   > Switch statements without a default case can lead to unexpected   
   > behavior and incomplete handling of all possible cases. When a switch   
   > statement lacks a default case, if a value is encountered that does   
   > not match any of the specified cases, the program will continue   
   > execution without any defined behavior or handling.   
      
   Maybe I misunderstood that sentence caused by my bad English. I knew   
   that in case the switch value is not present in any case inside the   
   switch, the program continues without doing anything (in the switch) and   
   without any problem.   
      
   int x = 3;   
   switch(x) {   
      case 1: printf("Hello");break;   
      case 2: printf("World");break;   
   }   
      
   Will the program execution continue without any defined behaviour?   
      
      
      
      
      
   [1]   
   https://clang.llvm.org/extra/clang-tidy/checks/bugprone/switch-m   
   ssing-default-case.html   
      
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