MohammedRazi K
razikallayi@gmail.com
www.facebook.com/razikallayi
twitter.com/razikallayi
in.linkedin.com/in/razikallayi
9...
Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
docu...
Flow of control
• Unless specified, the order of statement
execution is linear: one statement after another
in sequence
• ...
2
1
3
Selection statements
• Used to choose which statement to be executed next
• Therefore they are sometimes called conditiona...
The if Statement
The if statement has the following syntax:
if ( condition )
statement;
• if is a C reserved keyword.
• Th...
The if-else Statement
• If the condition is true, statement1 is executed; if
the condition is false, statement2 is execute...
Consider the following example,
int grade=76;
if ( grade >= 60 )
printf( "Passedn");
else
printf( "Failedn");
The above co...
• An if statement which is within another
if or else is called nested if.
• Braces can be used to specify the if
statement...
Syntax of nested if:
if(condition1)
{
if(condition2)
do this;
else //this else with condition2
{
do this;
and this;
}
}
el...
An example for nested if:
if(avg>=90)
printf("Student %s gets an A grade",name);
else if(avg>=80 &&avg<90)
printf("Student...
The Switch statement
• The switch statement provides another way to
decide which statement to execute next
• The switch st...
• Often a break statement is used as the last statement
in each case's statement list
• A break statement causes control t...
• A switch statement can have an optional
default case
• If the default case is present, control will
transfer to it if no...
• The expression of a switch statement must result in
an integral type, meaning an integer (byte, short,
int,) or a char
•...
The general syntax of a switch statement is:
switch ( expression )
{
case value1 :
statement-list1
case value2 :
statement...
switch (option)
{
case 'A':
aCount++;
break;
case 'B':
bCount++;
break;
case 'C':
cCount++;
break;
default:
otherCount++;
...
Iteration Statements
• Also known as loops
• It allow a set of instructions to be executed
until a certain condition is me...
The for Loop
• The syntax of for statement in C:
for (initialization expression;loop repetition condition;update expressio...
Nested Loops
• Nested loops consist of an outer loop with one or more
inner loops.
• e.g.,
for (i=1;i<=100;i++){
for(j=1;j...
For loop: An example
/*For loop to print even numbers below 100*/
for(i=2;i<100;i=i+2)
{
printf("%d,",i);
}
The While loop
• The syntax of do-while statement in C:
do
statement
while (loop repetition condition);
• The statement is...
An Example of the do-while Loop
/* Find even number input */
do{
printf(“Enter a value: ”);
scanf(“%d”, &num);
}while (num...
Jump Statements
• Also called unconditional branching.
• It means transfer of control to a specified
statement.
• C has fo...
The return statement
• Used to return fro a function
• It returns to the point at which the function is
called.
• It can h...
The goto statement
• Allows to transfer control to any other
statement in the function.
• General form
label:statement
got...
The break statement
• It can be used to terminate a case in switch
statement.
• Can used to force immediate loop terminati...
• Here, loop will terminate when i=10
for(i=0;i<=100;i++)
{
if(i==10)
{
break;
}
printf(“%d”,i);
}
The Continue Statement
• It allows to skip the current iteration and
hence wont run the remaining statements in
the loop.
for(i=0;i<=100;i++)
{
if(i==10)
{
break;
}
printf(“%d”,i);
}
• Here, loop will skip the printf statement when i=10 and inc...
thank you
Doubts…?
Want to learn more about programming or Looking to become a good programmer?
Are you wasting time on searching so many con...
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Control structures in C
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  • There are 3 types of control structures in C.
    1) Decision or conditional statements: if, if else, nested if, switch case
    2) Looping statements: while, do while, for, nested for
    3) Jumping statements:
    -> Conditional jumping: break, continue.
    -> Unconditional jumping: return, goto
  • Control structures in C

    1. 1. MohammedRazi K razikallayi@gmail.com www.facebook.com/razikallayi twitter.com/razikallayi in.linkedin.com/in/razikallayi 9746730324 Control Structures in C
    2. 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
    3. 3. Flow of control • Unless specified, the order of statement execution is linear: one statement after another in sequence • A control structure is any mechanism that departs from the default straight-line execution.
    4. 4. 2 1 3
    5. 5. Selection statements • Used to choose which statement to be executed next • Therefore they are sometimes called conditional statements • Conditional statements give us the power to make basic decisions • The C conditional statements are the: – if statement – if-else statement – switch statement
    6. 6. The if Statement The if statement has the following syntax: if ( condition ) statement; • if is a C reserved keyword. • The condition must be a boolean expression. It is evaluated to either true or false. • If the condition is true, the statement is executed. • If it is false, the statement is skipped.
    7. 7. The if-else Statement • If the condition is true, statement1 is executed; if the condition is false, statement2 is execute if ( condition ) statement1; else statement2;
    8. 8. Consider the following example, int grade=76; if ( grade >= 60 ) printf( "Passedn"); else printf( "Failedn"); The above code will produce an output: Passed Since the true statement only executes
    9. 9. • An if statement which is within another if or else is called nested if. • Braces can be used to specify the if statement to which an else clause belongs Nested if statements
    10. 10. Syntax of nested if: if(condition1) { if(condition2) do this; else //this else with condition2 { do this; and this; } } else //this else with condition1 do this; Note that in C an else statement always refers to the nearest if that is within the same block of else.
    11. 11. An example for nested if: if(avg>=90) printf("Student %s gets an A grade",name); else if(avg>=80 &&avg<90) printf("Student %s gets a B grade",name); else if(avg>=70 &&avg<0) printf("Student %s gets a C grade",name); else if(avg>=60 &&avg<70) printf("Student %s gets a D grade",name); else if(avg<60) printf("Student %s failed"); Nested if (contd…)
    12. 12. The Switch statement • The switch statement provides another way to decide which statement to execute next • The switch statement evaluates an expression, then attempts to match the result to one of several possible cases • Each case contains a value and a list of statements • The flow of control transfers to statement associated with the first case value that matches
    13. 13. • Often a break statement is used as the last statement in each case's statement list • A break statement causes control to transfer to the end of the switch statement • If a break statement is not used, the flow of control will continue into the next case • Sometimes this may be appropriate, but often we want to execute only the statements associated with one case The Switch statement(Contd…)
    14. 14. • A switch statement can have an optional default case • If the default case is present, control will transfer to it if no other case value matches • If there is no default case, and no other value matches, control falls through to the statement after the switch The Switch statement(Contd…)
    15. 15. • The expression of a switch statement must result in an integral type, meaning an integer (byte, short, int,) or a char • It cannot be a floating point value (float or double) • The implicit test condition in a switch statement is equality • You cannot perform relational checks with a switch statement The Switch statement(Contd…)
    16. 16. The general syntax of a switch statement is: switch ( expression ) { case value1 : statement-list1 case value2 : statement-list2 case value3 : statement-list3 default: statement } switch and case are reserved words If expression matches value2, control jumps to here The Switch statement(Contd…)
    17. 17. switch (option) { case 'A': aCount++; break; case 'B': bCount++; break; case 'C': cCount++; break; default: otherCount++; break; } The Switch statement(Contd…) An example for switch statement:
    18. 18. Iteration Statements • Also known as loops • It allow a set of instructions to be executed until a certain condition is met. • The loop structures available in C are: • For loop • While loop • Do while loop
    19. 19. The for Loop • The syntax of for statement in C: for (initialization expression;loop repetition condition;update expression) { statement } • The initialization expression set the initial value of the loop control variable. • The loop repetition condition test the value of the loop control variable. • The update expression update the loop control variable.
    20. 20. Nested Loops • Nested loops consist of an outer loop with one or more inner loops. • e.g., for (i=1;i<=100;i++){ for(j=1;j<=50;j++){ … } } • The above loop will run for 100*50 iterations. 5-22 Inner loop Outer loop
    21. 21. For loop: An example /*For loop to print even numbers below 100*/ for(i=2;i<100;i=i+2) { printf("%d,",i); }
    22. 22. The While loop • The syntax of do-while statement in C: do statement while (loop repetition condition); • The statement is first executed. • If the loop repetition condition is true, the statement is repeated. • Otherwise, the loop is exited.
    23. 23. An Example of the do-while Loop /* Find even number input */ do{ printf(“Enter a value: ”); scanf(“%d”, &num); }while (num % 2 !=0) 5-25 This loop will repeat if the user inputs odd number.
    24. 24. Jump Statements • Also called unconditional branching. • It means transfer of control to a specified statement. • C has four statements that perform unconditional branch – Call/return – Goto – Break – Continue
    25. 25. The return statement • Used to return fro a function • It returns to the point at which the function is called. • It can have a value with it. • General form: return (expression); • The expression is optional • Function can have more than one return statement, but will return at the first return statement
    26. 26. The goto statement • Allows to transfer control to any other statement in the function. • General form label:statement goto label;
    27. 27. The break statement • It can be used to terminate a case in switch statement. • Can used to force immediate loop termination by checking a condition
    28. 28. • Here, loop will terminate when i=10 for(i=0;i<=100;i++) { if(i==10) { break; } printf(“%d”,i); }
    29. 29. The Continue Statement • It allows to skip the current iteration and hence wont run the remaining statements in the loop.
    30. 30. for(i=0;i<=100;i++) { if(i==10) { break; } printf(“%d”,i); } • Here, loop will skip the printf statement when i=10 and incement i to 11
    31. 31. thank you
    32. 32. Doubts…?
    33. 33. Want to learn more about programming or Looking to become a good programmer? Are you wasting time on searching so many contents online? Do you want to learn things quickly? Tired of spending huge amount of money to become a Software professional? Do an online course @ baabtra.com We put industry standards to practice. Our structured, activity based courses are so designed to make a quick, good software professional out of anybody who holds a passion for coding.
    34. 34. Follow us @ twitter.com/baabtra Like us @ facebook.com/baabtra Subscribe to us @ youtube.com/baabtra Become a follower @ slideshare.net/BaabtraMentoringPartner Connect to us @ in.linkedin.com/in/baabtra Give a feedback @ massbaab.com/baabtra Thanks in advance www.baabtra.com | www.massbaab.com |www.baabte.com
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