if/else if statement

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i need control several values in app , i'm trying in way
code:
  if(condition 1)  {     //do something1  }  else if(condition 2)  {     //do something2  }  else if(condition 3)  {     //do something3  }  else  {     //do else  }
but looks 1st condition checked, other ignored.
possible use kind of control in objective-c? if not, how behaves that?
i'm checking if text fields filled before send data.
 

post real code. suggesting works normal c there must specific code. of course if condition 1 true we'd not expect of other conditions checked. if condition 1 true explain behaviour seeing.
 


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