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5.2.9 if

if ( boolean_expression ) true_block
if ( boolean_expression ) true_block else false_block
executes true_block if the boolean condition is true. If the if statement is followed by an else statement and the boolean condition is false, then false_block is executed.
int i = 9;
matrix m[i][i];
if (i > 5 and typeof(m) == "matrix")
  m[i][i] = i;
See Control structures; boolean expressions; break; else.