C Programming Tutorial For Beginners 06 selection
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switch（a） { case 1: printf(“Monday”);
case 2: printf(“Tuesday”); …… case 7: printf(“Sunday”); default : printf(“Input Error”); }
switch-case Selection
use break statement to jump off switch-case selection when necessary.
When a break statement occurs within a switch-case pattern, the execution will jump out of the switch-case from that point.
switch-case Selection Example 3 - 5
switch-case Selection
switch（exp） { case value_1: statement_1
case value_2: statement_2 …… case value_n: statement_n default : statement }
switch-case Selection
Tips
Flags are widely used to keep specific status for further processing.
Conditional Expressions
Conditional expressions (? :), provides an alternate way for if-else selection.
switch-case Selection
switch-case is a useful pattern for multibranch selections based on a valuematching mechanism, which is quite different with if-else selection.
max = ( a > b ) ? a : b; if( a > b )
max = a; else
max = b;
Question? Suggestion?
百度文库
Homework Page 66: Exercise 5, 6, 7, 8
C Programming Language
Lecture 6
Selection II
Outline
Review switch-case Selection Conditional Expressions
Review
Relational Operators Logical Operators if-else selection if- else if -else selection Nested if-else selection
case 2: printf(“Tuesday”); …… case 7: printf(“Sunday”); default : printf(“Input Error”); }
switch-case Selection
use break statement to jump off switch-case selection when necessary.
When a break statement occurs within a switch-case pattern, the execution will jump out of the switch-case from that point.
switch-case Selection Example 3 - 5
switch-case Selection
switch（exp） { case value_1: statement_1
case value_2: statement_2 …… case value_n: statement_n default : statement }
switch-case Selection
Tips
Flags are widely used to keep specific status for further processing.
Conditional Expressions
Conditional expressions (? :), provides an alternate way for if-else selection.
switch-case Selection
switch-case is a useful pattern for multibranch selections based on a valuematching mechanism, which is quite different with if-else selection.
max = ( a > b ) ? a : b; if( a > b )
max = a; else
max = b;
Question? Suggestion?
百度文库
Homework Page 66: Exercise 5, 6, 7, 8
C Programming Language
Lecture 6
Selection II
Outline
Review switch-case Selection Conditional Expressions
Review
Relational Operators Logical Operators if-else selection if- else if -else selection Nested if-else selection