Switch case in C++
- 1. SWITCH CASES Presented by BARANI G. 1
- 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. 2
- 3. General form: switch(expression) { case x: // code block break; case y: // code block break; default: // code block } 3
- 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. 4
- 5. Flow chart of switch statement: 5
- 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. 6
- 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. 7
- 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; 8
- 9. case 3: Cont… cout << "Wednesday"; break; case 4: cout << "Thursday"; break; case 5: cout << "Friday"; break; case 6: cout << "Saturday"; break; 9
- 10. case 7: Cont… cout << "Sunday"; break; default : cout<< "Invalid input" ; } return 0; } OUTPUT: Friday 10
- 11. Thank you! 11