Definition of switch statement, general form, keywords used in switch statement (such as break and default ) with example are in this slide.

1. SWITCH CASES
Presented by BARANI G.
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2. Switch cases:
◦ The switch statement evaluates an integral expression and chooses one of
several execution paths based on the expression’s value.
◦ In other words, a Switch statement provides a convenient way of selecting
among a (possibly large) number of fixed alternatives.
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3. General form:
switch(expression) {
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}
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4. How switch statements work:
◦ The switch expression is evaluated once.
◦ The value of the expression is compared with the values of each case.
◦ If there is a match, the associated block of code is executed.
The break and default keywords are optional.
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5. Flow chart of switch statement:
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6. The break keyword:
◦ When C++ reaches a break keyword, it break out of the switch block.
◦ This will stop the execution of more code and case testing inside the block.
◦ When match is found, and the job is done, it’s time for a break. There is o need
for more testing.
A break can save a lot of execution time as it ignores the execution of all the
rest of the code in the switch block.
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7. The default keyword:
◦ The default code specifies some code to run if there is no case match.
◦ The default keyword must be used as the last statement in the switch, and it
does not need a break.
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8. Example: Day of the week
#include <iostream>
using namespace std;
int main() {
int day = 5;
switch (day) {
case 1:
cout << "Monday ";
break;
case 2:
cout << "Tuesday";
break;
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9. case 3: Cont…
cout << "Wednesday";
break;
case 4:
cout << "Thursday";
break;
case 5:
cout << "Friday";
break;
case 6:
cout << "Saturday";
break;
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10. case 7: Cont…
cout << "Sunday";
break;
default :
cout<< "Invalid input" ;
}
return 0;
}
OUTPUT:
Friday
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11. Thank you!
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