how to apply switch case in c++ code example

Example 1: c++ switch multiple cases

#include <iostream> 
using namespace std; 
  
int main() { 
    // variable declaration 
	int input;
	switch(input){
	case 1: case 2: case 3: case 4:
		//executes if input is 1, 2, 3, or 4
		break;
	case 5: case 6: case 7:
		//executes if input is 5, 6, or 7
        break;
	default:
		//executes if input isn't any of the cases
    }
    return 0; 
}

Example 2: switch c++

switch(expression) {
  case x:
    // code block
    break;
  case y:
    // code block
    break;
  default:
    // code block
}