Loops in C Programming Language

Mar 20, 2017Download as pptx, pdf

25 likes30,395 views

Importance of loops in any programming language is immense, they allow us to reduce the number of lines in a code, making our code more readable and efficient.

Content
 Objective
 Introduction
Types of looping
while
do-while
for
 Assessment metric
Conclusion
References

Course Objective
 Understand the basic terminology used in computer
programming
 It stresses the strengths of C, which provide students with
the means of writing efficient, maintainable, and portable
code.
 write, compile and debug programs in C language.
 Increase the ability to learn new programming languages
OBJECTIVES

Topic Objective
 Understand the basics of looping.
 To use the while, do-while and for repetition statement to
execute statements in a program repeatedly.

INTRODUCTION
 Statements in a program are executed one after the other
ex: statement 1;
statement 2;
:
statement n;
 Sometimes, the user want to execute a set of statements
repeatedly.

 Loop statements are used to repeat the execution of
statement or blocks.
Iteration of a loop: the number of times the body of loop is
executed.
 Two types of loop structure are:
Pretest : Entry - controlled loop
Posttest : Exit – controlled loop

Pretest Vs. Posttest
Pretest : Condition is tested before each iteration to check
if loops should occur.
Posttest : Condition is tested after each iteration to check
if loop should continue (at least a single iteration occurs).
Conditio
n
Evaluate
d
Statements
false
true Conditio
n
Evaluate
d
Statements
true
false

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Loops in C Programming Language

1. Prepared By Mahantesh S. Devoor

2. Content  Objective  Introduction Types of looping while do-while for  Assessment metric Conclusion References

3. Course Objective  Understand the basic terminology used in computer programming  It stresses the strengths of C, which provide students with the means of writing efficient, maintainable, and portable code.  write, compile and debug programs in C language.  Increase the ability to learn new programming languages OBJECTIVES

4. Topic Objective  Understand the basics of looping.  To use the while, do-while and for repetition statement to execute statements in a program repeatedly.

5. INTRODUCTION  Statements in a program are executed one after the other ex: statement 1; statement 2; : statement n;  Sometimes, the user want to execute a set of statements repeatedly.

6.  Loop statements are used to repeat the execution of statement or blocks. Iteration of a loop: the number of times the body of loop is executed.  Two types of loop structure are: Pretest : Entry - controlled loop Posttest : Exit – controlled loop

7. Pretest Vs. Posttest Pretest : Condition is tested before each iteration to check if loops should occur. Posttest : Condition is tested after each iteration to check if loop should continue (at least a single iteration occurs). Conditio n Evaluate d Statements false true Conditio n Evaluate d Statements true false

8. TYPES OF LOOP  while loop  do-while loop  for loop

9. while Loop  It has a loop condition only that is tested before each iteration to decide whether to continue or terminate the loop.  The body of a while loop will execute zero or more times Syntax: while (<condition>){ <statement/block>; }

10. Example : int i=0; while(i<3){ printf(“Hellon”); i++; } Output: Hello Hello Hello Conditio n Evaluate d Statements true false Flow diagram

11. do…while Loop  Do while has a loop condition only that is tested after each iteration to decide whether to continue with next iteration or terminate the loop. Syntax: do{ <statement/block>; }while(condition);

12. Example: int i=0; do{ Printf (“Hellon”); i++; } while (i<3); Output: Hello Hello Hello Conditio n Evaluate d Statements true false Flow diagram

13. for Loop for loop has three parts:  Initializer is executed at start of loop.  Loop condition is tested before iteration to decide whether to continue or terminate the loop.  Increment is executed at the end of each loop iteration.

14. Syntax: for( [initialize]; [condition]; [incrementor] ) { <statement/block>; } Conditio n Evaluate d initialization Statements increament true false Flow diagram

15. Example: for(i=0; i<3; i++) { printf(“Hellon”); } Output: Hello Hello Hello

16. ASSESSMENT METRIC  What is looping? List the types of looping.  Explain the while loop with an example.  Give the difference between while and do-while loops  Explain the syntax of for loop with an example  List out the difference between while and for loop. And also explain the do-while loop.

17. CONCLUSION  Importance of loops in any programming language is immense, they allow us to reduce the number of lines in a code, making our code more readable and efficient.

18. REFERENCES [1]. E. Balaguruswamy, “Programming in ANSI C”, Third edition, Tata McGraw Hill Publications, 2002. [2]. P. B. Kotur, “Computer Concepts and C programming”, Kindle Edition, Sapna Book House, Bangalore, 2009.

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