[Solved] Difference betwen “if” sentences with different { structure [closed]

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Your first code fragment is badly indented, it should read:

if (i1)
   if (i2)
       s1;
   else
       s2;

Which is equivalent to your second fragment, but obviously very different from the third fragment:

if (i1) {
   if (i2)
       s1;
} else {
   s2;
}

This issue is called the dangling else problem. You can avoid it completely by always using curly braces { and } around blocks commanded by if. You would write the first and second fragments as:

if (i1) {
   if (i2) {
       s1;
   } else {
       s2;
   }
}

and the third as 

if (i1) {
   if (i2) {
       s1;
   }
} else {
   s2;
}

Wikipedia has an article about this very issue: https://en.wikipedia.org/wiki/Dangling_else

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solved Difference betwen “if” sentences with different { structure [closed]