说说GOTO

#include <stdio.h>

int main ()
{
   /* local variable definition */
   int a = 10;

   /* do loop execution */
   LOOP:do
   {
      if( a == 15)
      {
         /* skip the iteration */
         a = a + 1;
         goto LOOP;
      }
      printf("value of a: %d\n", a);
      a++;

   }while( a < 20 );

   return 0;
}

value of a: 10
value of a: 11
value of a: 12
value of a: 13
value of a: 14
value of a: 16
value of a: 17
value of a: 18
value of a: 19

// goto_statement.cpp
#include <stdio.h>
int main()
{
    int i, j;

    for ( i = 0; i < 10; i++ )
    {
        printf_s( "Outer loop executing. i = %d\n", i );
        for ( j = 0; j < 2; j++ )
        {
            printf_s( " Inner loop executing. j = %d\n", j );
            if ( i == 3 )
                goto stop;
        }
    }

    // This message does not print:
    printf_s( "Loop exited. i = %d\n", i );

    stop:
    printf_s( "Jumped to stop. i = %d\n", i );
}

Outer loop executing. i = 0
 Inner loop executing. j = 0
 Inner loop executing. j = 1
Outer loop executing. i = 1
 Inner loop executing. j = 0
 Inner loop executing. j = 1
Outer loop executing. i = 2
 Inner loop executing. j = 0
 Inner loop executing. j = 1
Outer loop executing. i = 3
 Inner loop executing. j = 0
Jumped to stop. i = 3