6_switch.pdf

PRG 155 – Programming Fundamentals Using C 6. switch Statement Switch statement is used to easily select one option from a number of options when making a decision. How it works?  A switch value is compared to a list of values called cases. The switch value might be a variable, an expre...

PRG 155 – Programming Fundamentals Using C 6. switch Statement Switch statement is used to easily select one option from a number of options when making a decision. How it works?  A switch value is compared to a list of values called cases. The switch value might be a variable, an expression, or a direct value.  Whenever is found that the switched value is equal to a case value, the block of code associated with that case is executed.  The execution continues with the statements of the next case (or cases) until the break statement is encountered.  The break statement is used to prevent the execution of the case or cases that follow. The break statement is optional.  If no case value is found to be equal to the switched value, a special case called default is executed. The default case is optional. Syntax PRG 155 – Programming Fundamentals Using C switch Statement Flowchart Rules to follow when using switch statement:  switch and case are keywords; must be written in lower case letters.  Relational operators are not allowed in switch statement.  The data type of case value and the switch value must be the same: integer or character.  A switch statement can have any number of cases.  Each case is followed by the case value and colon (‘:’).  Two or more cases can share one break statement.  The case values can be in any order.  The default can be placed anywhere in the switch.  No break is needed in the default case. PRG 155 – Programming Fundamentals Using C Example: int i= 2; switch (i) { case 1: printf("too low"); break; case 2: case 3: printf("good number"); break; default: printf("too high"); } References  Tan, H.H., and T.B. D’Orazio. C Programming for Engineering & Computer Science. USA: WCB McGRaw-Hill. 1999. Print.  Tutorialspoint.com. "Switch statement in C." Www.tutorialspoint.com. N.p., n.d. Web. 14 Feb. 2017..  Rajinikanth. "C Programming Language." C switch statement | c control statements | conditional control statements in c | C by Rajinikanth | C Programming Language. N.p., n.d. Web. 14 Feb. 2017..  "C switch...case Statement." C switch...case Statement. N.p., n.d. Web. 14 Feb. 2017..