Logical Control Structures

• Sequence
• Selection (IF, Evaluate)
• Iteration (PERFORM)

 Example I using NEXT SENTENCE 
IF A < B
   NEXT SENTENCE
ELSE
   MOVE 1 TO B
END-IF



IF A >= B
   MOVE 1 TO B
END-IF

 Example II 
IF A < C
   MOVE 1 TO A
ELSE
   MOVE 1 TO B
END-IF



 Do not mix field types in comparison 

 COBOL 74 Style without END-IF 

IF A = B
   ADD C TO D 
   MOVE E TO TOTAL.

IF A = B
   ADD C TO D. 
   MOVE E TO TOTAL.