import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import java.io.*;

public class Sample9_1{
  public static void main(String[] args){
    Workbook wb = new HSSFWorkbook();
    Sheet sheet = wb.createSheet();
    Row row1 = sheet.createRow(1);
    Row row2 = sheet.createRow(2);

    Cell cell1_1 = row1.createCell(1);
    Cell cell1_2 = row1.createCell(2);
    Cell cell1_3 = row1.createCell(3);
    Cell cell2_3 = row2.createCell(3);

    cell1_1.setCellValue(30);
    cell1_2.setCellValue(25);
    cell1_3.setCellFormula("B2+C2");
    cell2_3.setCellFormula("MOD(B2,C2)");

    FileOutputStream out = null;
    try{
      out = new FileOutputStream("sample9_1.xls");
      wb.write(out);
    }catch(IOException e){
      System.out.println(e.toString());
    }finally{
      try {
        out.close();
      }catch(IOException e){
        System.out.println(e.toString());
      }
    }
  }
}