The document discusses three types of control structures in computing: sequential logic which involves executing instructions in series, selection logic or conditional flow which determines which module to run based on conditions, and iteration logic or repetitive flow which repeats modules. Selection logic includes single alternative which runs one module if a condition is true, double alternative which runs one of two modules depending on if a condition is true or false, and multiple alternative which can run different modules based on multiple conditions. Iteration logic uses repeat-for loops to repeat a module a set number of times and repeat-while loops to repeat a module while a condition remains true.

1. CONTROL STRUCTURES
V.G. JYOTHI MAIN
COMPUTER
APPLICATION

2. CONTROL STRUCTURES
Sequence logic or Sequence
flow
Selection login or
Conditional flow
Iteration logic or Repetitive
flow
V.G. Jyothi Mani 2

3. Sequential Logic (Sequential Flow)
V.G. Jyothi Mani 3
Sequential flow in which the flow
depends on the series of instructions
given to the computer

4. Selection Logic (Conditional Flow)
• Selection logic simply involves a number of conditions or
parameters which decides one out of several written modules.
V.G. Jyothi Mani 4
Single Alternative
Double
Alternative
Multiple
Alternative

5. Selection Logic (Conditional Flow)
Single Alternative
IF (CONDITION)
THEN: [MODULE A]
[END OF IF
STRUCTURE]
Double
Alternative
IF (CONDITION), THEN:
[MODULE A]
ELSE:
[MODULE B]
[END IF STRUCTURE]
Multiple
Alternative
IF (CONDITION A), THEN:
[MODULE A]
ELSE IF (CONDITION B), THEN:
[MODULE B]
ELSE IF (CONDITION N), THEN:
[MODULE N]
[END IF STRUCTURE]
V.G. Jyothi Mani 5

6. Iteration Logic (Repetitive Flow)
• Repeat-for structure
Repeat for i = A to N by I:
[Module]
[End of LOOP]
• Repeat-while structure
Repeat while condition:
[Module]
V.G. Jyothi Mani 6

7. V.G. Jyothi Mani 7
Double Alternative
Control Flo
Repeat-For Flow Repeat-While Flow