Never put \(if\) in \(then\) clause

Selection Statements

Three types of selection statements exist in C:

if ( expression ) statement

In this type of if-statement, the sub-statement will only be executed iff the expression is non-zero.

if ( expression ) statement else statement

In this type of if-statement, the first sub-statement will only be executed iff the expression is non-zero; otherwise, the second sub-statement will be executed. Each else matches up with the closest unmatched if, so that the following two snippets of code are not equal:

if(expression)
   if(secondexpression)statement1;
else
   statement2;

if(expression)
   {
     if(secondexpression)statement1;
   }
else
   statement2;

because in the first, the else statement matches up with the if statement that has secondexpression for a control, but in the second, the braces force the else to match up with the if that has expression for a control.

If ...... else if ..... else if ..... else

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