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Lab 12: Switch Statement
Lab Objectives:
Switch Statement How does the switch statement work? How does the switch statement work?
Software/Tools:
PC
Dev-C++
C++ Switch…Case Statement
The switch statement allows us to execute a block of code among many alternatives. You can do the same thing with the if...else statement. However, the syntax of the switch statement is much easier to read and write. Syntax switch (expression) { case constant1: // code to be executed if // expression is equal to constant1; break; case constant2: // code to be executed if // expression is equal to constant2; break;
default: // code to be executed if // expression doesn't match any constant }
How does the switch statement work?
The expression is evaluated once and compared with the values of each case label. If there is a match, the corresponding code after the matching label is executed. For example, if the value of the variable is equal to constant2, the code after case constant2: is executed until the break statement is encountered. If there is no match, the code after default: is executed. Note : We can do the same thing with the if...else..if ladder. However, the syntax of the switch statement is cleaner and much easier to read and write.
Example: Create a Calculator using the switch Statement // Program to build a simple calculator using switch Statement #include using namespace std; int main() { char oper; float num1, num2; cout << "Enter an operator (+, - , , /): "; cin >> oper; cout << "Enter two numbers: " << endl; cin >> num1 >> num2; switch (oper) { case '+': cout << num1 << " + " << num2 << " = " << num1 + num2; break; case '-': cout << num1 << " - " << num2 << " = " << num1 - num2; break; case '': cout << num1 << " * " << num2 << " = " << num1 * num2; break; case '/': cout << num1 << " / " << num2 << " = " << num1 / num2; break; default: // operator is doesn't match any case constant (+, - , *, /)
cout << "Error! The operator is not correct"; break; } return 0; } Output 1 Enter an operator (+, - , *, /): + Enter two numbers:
2.3 + 4.5 = 6. Output 2 Enter an operator (+, - , *, /): - Enter two numbers:
2.3 - 4.5 = - 2. Output 3 Enter an operator (+, - , *, /): * Enter two numbers:
2.3 * 4.5 = 10.
Lab Tasks:
- Write a program which takes two integer values as user input and then check if both are equal and tells user the result. If not equal, then it should also display the maximum value as output. Expected Output:
- Using Switch statement in C++, write a program that input a character from the user that find out whether it is vowel or consonant number. Expected Output:
- Write a program which asks user to input percentage and then it should display the grade using following criteria. Use switch statement.
Percentage >= 95% : Grade A+ Percentage >= 90% : Grade A Percentage >= 85% : Grade B+ Percentage >= 80% : Grade B Percentage >= 70% : Grade C+ Percentage >= 60% : Grade C Percentage >= 40% : Grade D Percentage < 40% : Grade F Expected Output:
