Break; continue; goto; return application in the loop, continuegoto

Break; continue; goto; return application in the loop, continuegoto

1. break indicates that the program jumps out of the loop and points to the first statement after the loop body;

Int I = 1;

While (I <= 10)

{

If (I = 6)

Break;

Console. writeline ("{0}", I ++ );

}

Console. readkey ();

The variable I is increased to 6 and then jumps out of the loop. The program then executes console. readkey ();

 

2. continue only indicates that the current loop exists, rather than the entire loop body.

Int I;

For (I = 1; I <= 10; I ++)

{

If (I % 2 = 0)

Continue;

Console. writeline (I );

}

When I is an even number, the current loop exists, but the loop continues until I> 10. Therefore, the running result is, 9.

 

3. goto can jump out of the loop body to the label statement. It is not recommended for beginners to use goto.

Int I = 1;

While (I <= 10)
{
If (I = 6)
{
Goto exitpoint;
}
Console. WriteLine ("{0}", I ++ );
}
Console. WriteLine ("this code will never be reached! "); // This statement cannot be executed
Exitpoint:
Console. WriteLine ("the loop use goto! ");
Console. WriteLine ("goto can contain several sentences! ");
Console. ReadKey ();

When I = 6, the loop body jumps out and executes the goto statement, but the program behind the loop body cannot be executed.

 

4. return exits the entire method containing the loop body,

Static void Main (string [] args)
{
Printout ();
Console. WriteLine ("out of printout method! ");
Console. ReadKey ();
}
Static void printout ()
{
Int I = 1;
While (I <= 10)
{
If (I = 6)
{
Return;
}
Console. WriteLine ("{0}", I ++ );
}
Console. WriteLine ("this code will never be reached! "); // Execution failed
}

When I = 6, the printout () method is directly displayed.