Quelle  MaxMin.cob   Sprache: Cobol

       identification division.
       program-id. maxmin.
       author. " Gannod/Cheng - Strongest Postcondition".
       date-written. 2.1.2006.
       data division.
       working-storage section.
       77 a        pic 9(4)V99.
       77 b        pic 9(4)V99.
       77 c        pic 9(4)V99.
       77 Largest  pic 9(4)V99.
       77 Smallest pic 9(4)V99.
       procedure division.
         move 5 to a
         move 10 to b
         call swapa using a, b
         call swapb using a, b
         call funnyswap using a, b
         call FindMaxMin using a, b, Largest, Smallest
         move Largest to c
        end-program maxmin.
       
       identification division.
       program-id. FindMaxMin.
       author. " Gannod/Cheng - Strongest Postcondition".
       date-written. 2.1.2006.
       data division.
       linkage section.
       77 NumOne       pic 9(4)V99.
       77 NumTwo       pic 9(4)V99.
       77 Maxx         pic 9(4)V99.
       77 Minn         pic 9(4)V99.
       procedure division using NumOne, NumTwo, Maxx, Minn.
         if NumOne > NumTwo then
           move NumOne to Maxx
           move NumTwo to Minn
         else
           move NumTwo to Maxx
           move NumOne to Minn
         end-if
        end-program FindMaxMin.      
       
       
       identification division.
       program-id. swapa.
       author. " Gannod/Cheng - Strongest Postcondition".
       date-written. 2.1.2006.
       data division.
       linkage section.
       77 X       pic 9(4)V99.
       77 Y       pic 9(4)V99.
       procedure division using X, Y.
         add X to Y
         subtract X from Y giving X
         subtract X from Y
        end-program swapa.        
        
       identification division.
       program-id. swapb.
       author. " Gannod/Cheng - Strongest Postcondition".
       date-written. 2.1.2006.
       data division.
       working-storage section.
       77 temp    pic 9(4)V99.
       linkage section.
       77 X       pic 9(4)V99.
       77 Y       pic 9(4)V99.
       procedure division using X, Y.
         move X to temp
         move Y to X
         move temp to Y
        end-program swapb.       

        
       identification division.
       program-id. funnyswap.
       author. " Gannod/Cheng - Strongest Postcondition".
       date-written. 2.1.2006.
       data division.
       working-storage section.
       77 temp    pic 9(4)V99.
       linkage section.
       77 X       pic 9(4)V99.
       77 Y       pic 9(4)V99.
       procedure division using X, Y.
         move temp to X
         move Y to X
         move temp to Y
        end-program funnyswap.