static void printPrincipalDiagonal ( int mat [ ] [ ] , int n ) {
  System . out . print ( "Principal Diagonal: " ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    System . out . print ( mat [ i ] [ i ] + ", " ) ;
  }
  System . out . println ( ) ;
}

static void printPrincipalDiagonal ( int mat [ ] [ ] , int n ) { System . out . print ( " Principal ▁ Diagonal : ▁ " ) ; for ( int i = 0 ; i < n ; i ++ ) { System . out . print ( mat [ i ] [ i ] + " , ▁ " ) ; } System . out . println ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (string_literal))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list)))))