=
if (expression) else switch
while (expression) for (expression;expression;expression) do {block}
	if ( i == j)
        {
          printf("martin \n");
        }
The statement block containing the printf is only executed 
if the i == j 
expression evaluates to TRUE.
	int add( int a, int b)      /* Function definition */
	{
	  int c;
	  c = a + b;
	  return c;
	}
The statements in this block will only be executed if the  add  function
is called. Complete function example
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