Mainframe COBOL to Java, C# & Cloud


Comparison of COBOL vs. Translated & Refactored C#

In this example, we compare a small COBOL program with C# code generated by the SoftwareMining COBOL Refactoring tool.


COBOL to C# Success Stories

Our primary goal with this example is to showcase the readability and maintainability of the generated code. Please note that this straightforward example does not delve into addressing complex issues like the removal of GO TO statements, elimination of dead code, handling REDEFINEs, CICS, Pointers, and more.

For a comprehensive understanding of addressing these complex challenges, please refer to our guide on Essential Features for Successful COBOL to C# Conversion Projects.

Alternatively, Download and try COBOL to C# Conversion tool to see what your organization's code looks like in C#.

Noteworthy issues:

  1. 01 level COBOL declarations are translated to Data-Access-Objects (DAO) capable of handling REDEFINES, COMPUTATIONAL, OCCURS-DEPENDING, and many other COBOL features (see WS-DATA structure).
  2. The 01 level declarations from FILE-SECTION are translated to Object-Relational-Model (ORM) classes.
  3. The 01 level WORKING-STORAGE definitions used in CICS READ/WRITE statements will also be converted to ORM classes.
  4. The 01 level declarations not referenced will be automatically commented out.
  5. The Translator removes references to unused DAOs and reuses the ones that it can.
  6. The Translator removes many GO TO statements. The SoftwareMining Framework libraries will provide support for the remaining ones.
  7. Batch programs: Translated C# can be run from the command line or from Unix Shell scripts translated from JCL.
  8. Online applications: Translated C# system needs to be deployed on Application servers such as Microsoft IIS.

COBOL vs C# - Side by side

   
  PROGRAM-ID. LOAN.
  DATA DIVISION.
  FILE SECTION.

  WORKING-STORAGE SECTION.
  01  WS-VARS.
    05 PRINCIPAL          PIC 9(9) VALUE 0.
    05 INTEREST-RATE      PIC 99V99 VALUE 0.
    05 LOAN-LENGTH        PIC 99 VALUE 0.
    05 NEXT-INTEREST      PIC 99V99.
    05 NEXT-YEAR          PIC 99.
  01 CLIENT-RECORD.
    05 NAME               PIC X(20).
    05 ADDRESS            PIC X(20) OCCURS 3 TIMES.
    05 ID                 PIC 9(4) COMP.

  ...
  
  
  
  
  
 /// Sample COBOL to C# translated code
namespace Softwaremining.Cobol2CSharp.Example
{
 public sealed class Loan  : BaseService  {
  
  // Note: 01 level WS-VARS name is simplified (Optional) 
  // and converted to a DAO
  // The DAO handles REDEFINES, COMP, OCCURS-DEPENDING, ... 
  private Vars ;
  
  // Client-RECORD has been translated to ClientRecord DAO, 
  // but since the program does not reference ClientRecord, 
  // it will automatically be commented out.
  
  // private ClientRecord clientRecord;
  ...
  /// constructor 
  public Loan(BaseService parent) : base(parent) 
  {
    vars = new Vars(this);
    // clientRecord = new ClientRecord(this);
	
   ...
  
  * Main entry point to program
   LOAN-MAIN-001.
   
  *  -
  * CLEAR SCREEN AND READ DATA
  *  -

       IF LOAN-LENGTH > 4 THEN
          COMPUTE START-YEAR = LOAN-LENGTH - 4
       ELSE
      COMPUTE START-YEAR = 0.

       IF INTEREST-RATE > 0.4 THEN
          COMPUTE START-INTEREST = INTEREST-RATE - 0.4
       ELSE
          COMPUTE START-INTEREST = 0
       END-IF
     
       MOVE 1 TO YEAR-ROW.
   
  
  *  -
  * GO THRU THE NUMBER OF YEARS
  *  -

       MOVE "% Rate->" TO DSP-NO-YRS(1).
       MOVE START-YEAR TO NEXT-YEAR
       PERFORM VARYING YEAR-ROW FROM 2 BY 1 UNTIL YEAR-ROW = 11
         PERFORM DO-NEXT-ROW
         ADD 1 TO NEXT-YEAR
       END-PERFORM.

	   


	   

  *  -
  *  AND EXIT
  *  -
       STOP RUN.
	   
  
  /// <summary>
  /// Main Entrance to program
  /// </summary> 
  protected void LoanMain () 
  {
   
   //   - 
   //  CLEAR SCREEN AND READ DATA 
   //   - 
   if (vars.LoanLength > 4)
   {
     vars.StartYear = vars.LoanLength - 4;
   } else
   {
     vars.StartYear = 0;
   }
	  
   if (vars.InterestRate > 0.4)
   {
     vars.StartInterest = vars.InterestRate - 0.4;
   } else
   {
     vars.StartInterest = 0;
   }
   vars.YearRow = 1;
   vars.setYearRow(1);
   //   - 
   //  GO THRU THE NUMBER OF YEARS 
   //   - 
   displayResult.SetNoYrs(0, "% Rate->");
   vars.NextYear = vars.StartYear;
   vars.YearRow = 2;
   while (vars.YearRow != 11)
   {
     DoNextRow ();
     vars.NextYear = vars.NextYear + 1;
     vars.YearRow = vars.YearRow + 1;
   }
   //   - 
   //   AND EXIT 
   //   - 
   Stop();
 }


  * 
  * Calculates values for individual rows
  * 
   DO-NEXT-ROW.

       MOVE START-INTEREST TO NEXT-INTEREST

	   
       PERFORM VARYING INTEREST-COL FROM 1 BY 1
         UNTIL INTEREST-COL = 10
         MOVE NEXT-INTEREST TO DSP-RESULT(1, INTEREST-COL)
         PERFORM CALCULATE
         MOVE NEXT-RESULT TO DSP-RESULT(YEAR-ROW, INTEREST-COL)
         ADD 0.1 TO NEXT-INTEREST
       END-PERFORM.

	   
	   
  /// <summary>
  /// Calculates values for individual rows
  </summary>
  protected void DoNextRow () {
   vars.NextInterest = vars.StartInterest;
      
   vars.InterestCol = 1;
	  
   while (vars.InterestCol != 10)
   {
     displayResult.SetResult(0, vars.InterestCol - 1
	    , vars.NextInterest);
     Calculate();
     displayResult.SetResult(vars.YearRow - 1, vars.InterestCol - 1
	    , vars.NextResult);
     vars.NextInterest = vars.NextInterest + 0.1;
     vars.InterestCol = vars.InterestCol + 1;
   }
 }

  * 
  * The next paragraph calculates CELL values
  * 
   CALCULATE.
       COMPUTE INTDEC = NEXT-INTEREST / (12.0 * 100.0)
       COMPUTE NUMMONTHS = NEXT-YEAR * 12.0
	   ...
   
  /// <summary>
  /// The next paragraph calculates CELL values
  </summary>
  protected void Calculate () {
   vars.Intdec = vars.NextInterest / (12.0 * 100.0);
   vars.Nummonths = (int)((double)vars.NextYear * 12.0);
   ...
 }
 





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