What is the purpose of anonymous { } blocks in C style languages?

Question

What is the purpose of anonymous { } blocks in C style languages (C, C++, C#)

Example -

void function()
{

  {
    int i = 0;
    i = i + 1;
  }

          


        

Answer 1

A useful use-cas ihmo is defining critical sections in C++. e.g.:

int MyClass::foo()
{    
   // stuff uncritical for multithreading
   ...
   {
      someKindOfScopeLock lock(&mutexForThisCriticalResource);
      // stuff critical for multithreading!
   }
   // stuff uncritical for multithreading
   ...    
}

using anonymous scope there is no need calling lock/unlock of a mutex or a semaphore explicitly.