Topic       : C-Language Documentation
Author      : John Kormylo
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Subject     : Documentation/C-Language
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View Ref-File[ if / else ]

Syntax:
  if( <test> ) { <code> }        or         if( <test> ) <statement>;
  else { <code> }                or         else <statement>;

where <test> is a logical expression, <code> is one or more lines of
executable C code, and <statement> is a single statement.

The 'else' statement is optional, but must follow the 'if' block
immediately when used.

Note: Since 0 is FALSE and anything else is TRUE, it is common to use
      'if(value)' in place of 'if(value != 0)' or use 'if(!value)'
      instead of 'if(value == 0)' where 'value' can be almost any data
      type expression.

See also switch and Logical Operators.