Branches Program Design, Branches and Loops

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Selim Aksoy Bilkent University Department of Computer Engineering [email protected]

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Branches are used to select and execute specific sections of the code while skipping other sections Selection of different sections depend on a condition statement We will learn: n n

if statement switch statement

Spring 2004

Branches: “if” Statement

Conditions can be: n

condition

if ( condition ), statement 1 statement 2 ...

true statement group

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statement group

any real value (0 is false, non-zero is true) combination of relational and logical operators n

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end

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CS 111

3

Branching Examples n

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if ( r 100 ) ), disp( [ ‘Grade must be in [0,100] range’ ] ); end if isinf( result ), disp( ‘Result is infinite’ ); end

Spring 2004

Spring 2004

CS 111

isempty() isnumeric(), ischar() isinf(), isnan() exist() CS 111

4

Branching Examples

Examples: n

e.g. ( x > 0 ) & ( x < 10 )

logical functions

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Spring 2004

2

Branches: “if” Statement n

false

CS 111

5

Water tank example: r = input('Enter the radius of the tank base (in meters):'); if ( r