title	Transfers of Control | Microsoft Docs
ms.custom
ms.date	11/04/2016
ms.reviewer
ms.suite
ms.technology	cpp-language
ms.tgt_pltfrm
ms.topic	language-reference
dev_langs	C++
helpviewer_keywords	control flow, branching control flow, transferring control
ms.assetid	aa51e7f2-060f-4106-b0fe-331f04357423
caps.latest.revision	7
author	mikeblome
ms.author	mblome
manager	ghogen
translation.priority.ht	cs-cz de-de es-es fr-fr it-it ja-jp ko-kr pl-pl pt-br ru-ru tr-tr zh-cn zh-tw

Transfers of Control

You can use the goto statement or a case label in a switch statement to specify a program that branches past an initializer. Such code is illegal unless the declaration that contains the initializer is in a block enclosed by the block in which the jump statement occurs.

The following example shows a loop that declares and initializes the objects total, ch, and i. There is also an erroneous goto statement that transfers control past an initializer.

// transfers_of_control.cpp  
// compile with: /W1  
// Read input until a nonnumeric character is entered.  
int main()  
{  
   char MyArray[5] = {'2','2','a','c'};  
   int i = 0;  
   while( 1 )  
   {  
      int total = 0;  
  
      char ch = MyArray[i++];  
  
      if ( ch >= '0' && ch <= '9' )  
      {  
         goto Label1;  
  
         int i = ch - '0';  
      Label1:  
         total += i;   // C4700: transfers past initialization of i.  
      } // i would be destroyed here if  goto error were not present  
   else  
      // Break statement transfers control out of loop,  
      //  destroying total and ch.  
      break;  
   }  
}  

In the preceding example, the goto statement tries to transfer control past the initialization of i. However, if i were declared but not initialized, the transfer would be legal.

The objects total and ch, declared in the block that serves as the statement of the while statement, are destroyed when that block is exited using the break statement.