Code:
//Generated by wsdl2apex

public class wwwWebservicexNet {
    public class ConvertTemperatureSoap {
        public String endpoint_x = 'http://www.webservicex.net/ConvertTemperature.asmx';
        public Map<String,String> inputHttpHeaders_x;
        public Map<String,String> outputHttpHeaders_x;
        public String clientCert_x;
        public String clientCertPasswd_x;
        private String[] ns_map_type_info = new String[]{'http://www.webserviceX.NET/', 'wwwWebservicexNet'};
      public Double ConvertTemp(Double Temperature,String FromUnit,String ToUnit) {
            wwwWebservicexNet.ConvertTemp_element request_x = new wwwWebservicexNet.ConvertTemp_element();
            wwwWebservicexNet.ConvertTempResponse_element response_x;
            request_x.Temperature = Temperature;
            request_x.FromUnit = FromUnit;
            request_x.ToUnit = ToUnit;
            Map<String, wwwWebservicexNet.ConvertTempResponse_element> response_map_x = new Map<String, wwwWebservicexNet.ConvertTempResponse_element>();
            response_map_x.put('response_x', response_x);
            WebServiceCallout.invoke(
              this,
              request_x,
              response_map_x,
              new String[]{endpoint_x,
              'http://www.webserviceX.NET/ConvertTemp',
              'http://www.webserviceX.NET/',
              'ConvertTemp',
              'http://www.webserviceX.NET/',
              'ConvertTempResponse',
              'wwwWebservicexNet.ConvertTempResponse_element'}
            );
            response_x = response_map_x.get('response_x');
            return response_x.ConvertTempResult;
        }
    }
    public class ConvertTempResponse_element {
        public Double ConvertTempResult;
        private String[] ConvertTempResult_type_info = new String[]{'ConvertTempResult','http://www.w3.org/2001/XMLSchema','double','1','1','false'};
        private String[] apex_schema_type_info = new String[]{'http://www.webserviceX.NET/','true'};
        private String[] field_order_type_info = new String[]{'ConvertTempResult'};
    }
    public class ConvertTemp_element {
        public Double Temperature;
        public String FromUnit;
        public String ToUnit;
        private String[] Temperature_type_info = new String[]{'Temperature','http://www.w3.org/2001/XMLSchema','double','1','1','false'};
        private String[] FromUnit_type_info = new String[]{'FromUnit','http://www.webserviceX.NET/','TemperatureUnit','1','1','false'};
        private String[] ToUnit_type_info = new String[]{'ToUnit','http://www.webserviceX.NET/','TemperatureUnit','1','1','false'};
        private String[] apex_schema_type_info = new String[]{'http://www.webserviceX.NET/','true'};
        private String[] field_order_type_info = new String[]{'Temperature','FromUnit','ToUnit'};
    }
}