Switch Case in C++

February 17, 2023

Switch-Case in C++

On this page we will  discuss about switch-case in C++. Switch case allows you to select the required block of code  from an available block of codes.Switch case statement evaluates a given expression and based on the evaluated value(matching a certain condition), it executes the statements associated with it
Switch Case in C++

Switch Case in C++ Language

  • First, the compiler searches the switch expression, top to bottom from available case labels
  • If a case label is matched with the switch expression then body under case label gets executed, then all other case labels get skipped
  • If no case label is matched with switch expression body under default get executed
  • Remember, only one case label gets executed from available case labels,  i.e  case label that is matched with the switch expression

Syntax:

switch (expression)
{
    case constant1:
         //code
        break;
    case constant2:
        // code
        break;
        .
        .
        .
    default:
}

Loop Types in C++

Decision Making in C++

Array in C++

String in C++

Function in C++

C++ program to demonstrate switch case

Run 
#include<iostream> 
using namespace std;
int main ()
{
  char oper = '+';
  float num1 = 8, num2 = 3;
  cout << "Number 1 = " << num1 << endl;
  cout << "Number 2 = " << num2 << endl;
  cout << "operator = " << oper << endl;
  cout << "result: ";
  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:

      cout << "Error! The operator is not correct";
      break;
    }

  return 0;
}

Output

Number 1 = 8
Number 2 = 3
operator = + result: 8 + 3 = 11

Points to Remember:

  • Using break is optional but it results in the execution of all case labels from matched case label
Run 
#include<iostream>
using namespace std;
int main()
{
  switch(2)
  { 
     case 1: cout<<"Laxmi\n";
     case 2: cout<<"trishaank\n";//matched case label
     case 3: cout<<"rishvik\n";  
     deafult: cout<<"vijay";
   }
}
Output: 
trishaank
rishvik
vijay
Run 
#include<iostream>  
using namespace std;
int main ()
{
  switch (2)
    {
    case 1:
      cout << "Laxmi\n";
      break;
    case 2:
      cout << "trishaank\n";	//matched case label 
      break;
    default:
      cout << "vijay";
      break;
    case 3:
      cout << "rishvik\n";
    }
}
Output: 
trishaank
Run 
#include<iostream>
using namespace std;
int main ()
{
  switch (2)
    {
    case 1:
      cout << "Laxmi\n";
      break;
    case 1 + 1:		//same as case 2
      cout << "trishaank\n";	//matched case label 
      break;
    default:
      cout << "Vijay";
      break;
    case 1 + 1 + 1:
      cout << "rishvik\n";
    }
}

Output:

trishaank

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