1. Structured Program Development in C
Dr. Nouf Aljaffan
Nouf Aljaffan (C) 2018

2. Iteration & Looping
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3. Means of iteration: Counter-Controlled Iteration
Sentinel-controlled iteration
definite iteration
It requires
The name of a control variable (or loop counter).
The initial value of the control variable.
The increment (or decrement) by which the control variable is modified each time through the loop.
The condition that tests for the final value of the control variable (i.e., whether looping should continue).
indefinite iteration
The precise number of iterations isn’t known in advance, and
The loop includes statements that obtain data each time the loop is performed.
Nouf Aljaffan (C) 2018

4. Iteration & Looping
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5. While Iteration Statements
Initialization
While( condition){
statements }
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6. While Iteration Statements
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7. for Iteration Statement
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8. for Iteration Statement
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9. do…while Iteration Statement
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10. break and continue Statements
break and continue are used to alter the flow of control.
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11. break Statement
break can be used in a while, for, do…while or switch statement
causes an immediate exit from that statement.
Program execution continues with the next statement after that while, for, do…while or switch.
Nouf Aljaffan (C) 2018

12. continue Statement continue can be used in a while, for or do…while
Cause skipping the remaining statements in that control statement’s body
and performs the next iteration of the loop.
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13. Confusing Equality (==) and Assignment (=) Operators
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14. Logical Operator Logical AND (&&) Operator Logical OR (||) Operator
Logical Negation (!) Operator
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15. Exercises
Sum the odd integers between 1 and 99 using a for statement. Use the unsigned integer
variables sum and count.
Print the integers from 1 to 20 using a while loop and the counter variable x. Print only five integers per line. [Hint: Use the calculation x % 5. When the value of this is 0, print a newline character, otherwise print a tab character.]
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16. Conclusion Variables Data Types
Expression represent a single data item such as a number or character
Statement caused the computer to carry out some action
Branching
If statement
If..Else statement
Nested if statement
Switch statement
Looping
For statement
While statement
Do while statement
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17. Questions?
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