Switch statement in C++

switch:- It is a multi branch statement which can be used to select and execute one of the available statements.

                switch(value)

                {

                                case 1:    statement 1;      break;

                                case 2:    statement 2;      break;

                                case n:    statement n;      break;

                                default:    statement d;

                }

Where value can be a variable of type numeric or character. The case label 1 to n can also be written with constant identifiers.

                When the value assigned matches with case label 1 statement 1 is executed. The break statement written after statement 1 transfers the control out of the switch statement. When the value doesn’t match with case label 1 then it checks with case label 2 and so on. When the value assigned doesn’t match with any of the case labels (1 to n) then the default clause is considered and the statement d is executed.

                Default clause is optional like else clause in if-else-if-else statement.

example:

switch(c)

{

case1:     cout<< “north”;      break;

case2:     cout<< “south”;      break;

case3:     cout<< “east”;        break;

case4:     cout<< “west”;       break;

default:   break;

}

Q. Write a program to display the grades as listed below by using switch statement

80-100             Distinction

60-79               Grade A

40-59               Grade B

Otherwise fail

#include<iostream>

void main()

{

int m;

cout<< “Enter marks scored: ”;

cin>> m;

switch( m/10 )                     //marks are divided by 10

{

case 10:

case 9:

case 8:       cout << “Distinction\n”;    break;

case 7:

case 6:       cout << “Grade A\n”;       break;

case 5:

case 4:       cout << “Grade B\n”;       break;

default:       cout << “Fail\n”;              break;

}

}

Q. Write a program to design simple calculator by using switch statement to carry out addition, multiplication, division and subtraction.

Q. Write a program to read a number from 1-7 and print day of week corresponding to that number using switch statement.