static int countChars ( String str , int n ) {
  int i = 0 , cnt = 0 ;
  while ( i < n ) {
    if ( str . charAt ( i ) == '0' ) i += 1 ;
    else i += 2 ;
    cnt += 1 ;
  }
  return cnt ;
}

static int countChars ( String str , int n ) { int i = 0 , cnt = 0 ; while ( i < n ) { if ( str . charAt ( i ) == '0' ) i += 1 ; else i += 2 ; cnt += 1 ; } return cnt ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) alternative: (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))) (return_statement (identifier))))