Control structures in c

Arun .R. [email protected]/

arunrmenontwitter.com/iamarunmenonin.linkedin.com/in/

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Control Structures in C

Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

Control Structures

• System working• Why control structures ?• What is control Structures?

Styles of Control Structures in C

• Branching• Looping

Branching

• What is Branching ?• if statements• ? : Operator• switch statement

if statements

• If• if (expression)

statement; or • if (expression) {

Block of statements;}

• If ……..else if (expression) { Block of statements; }

else { Block of statements; }

• else ifif (expression)

{ Block of statements; } else if(expression){ Block of statements; }

#include <stdio.h> main() { int cows = 6; if (cows > 1)

printf("We have cows\n"); if (cows > 10)

printf("loads of them!\n"); else printf("Executing else part...!\n"); if (cows == 5 ) {

printf("We have 5 cows\n"); } else if( (cows == 6 ) {

printf("We have 6 cows\n"); }

We have cows

Executing else part...!

We have 6 cows

? : Operator

• Similar to if • ternary operator

Eg#include <stdio.h> main() { int a , b; a = 10; printf( "Value of b is %d\n", (a == 1) ? 20: 30 ); printf( "Value of b is %d\n", (a == 10) ? 20: 30 ); }

Value of b is 30Value of b is 20

switch statement#include <stdio.h> main() { int Grade = ‘ ’; switch( Grade ) {

case 'A' : printf( "Excellent\n" ); break; case 'B' : printf( "Good\n" ); break; case 'C' : printf( "OK\n" ); break; case 'D' : printf( "Mmmmm....\n" ); break; case 'F' : printf( "You must do better than this\n" ); break; default : printf( "What is your grade anyway?\n" ); break;

}}

A

Excellent

B C D F def

GoodOkMmmm

You must do ..

What is your

Looping

• What is looping• for• while• dowhile

for loop

#include <stdio.h> main()

{ int i;

for( i = 0; i <= j; i ++ ) { printf("Hello %d\n", i ); if( i == 6 ) { break; } }

}

Hello 0Hello 1Hello 2Hello 3Hello 4Hello 5Hello 6

while

#include <stdio.h> main() { int i = 0; while ( i < 5 )

{ if(i==4)continue; printf("Hello %d\n", i ); i = i -1; }

}

Hello 0Hello 1Hello 2

Hello 5

do while#include <stdio.h> main() { int i = 10; do{ printf("Hello %d\n", i ); i = i -1; if( i == 6 ) { break; } }while ( i > 0 ); }

Hello 10Hello 9Hello 8Hello 7Hello 6

#include <stdio.h> main() { int i = 1; do{ printf("Hello %d\n", i ); i = i -1; if( i == 6 ) { break; } }while ( i > 5 ); }

Hello 1

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