switch case c 2b 2b

1#include <iostream> 
2using namespace std; 
3  
4int main() { 
5    // variable declaration 
6	int input;
7	switch(input){
8	case 1: case 2: case 3: case 4:
9		//executes if input is 1, 2, 3, or 4
10		break;
11	case 5: case 6: case 7:
12		//executes if input is 5, 6, or 7
13        break;
14	default:
15		//executes if input isn't any of the cases
16    }
17    return 0; 
18} 

1switch(expression) {
2  case x:
3    // code block
4    break;
5  case y:
6    // code block
7    break;
8  default:
9    // code block
10}

1switch (n)
2{
3    case 1: // code to be executed if n = 1;
4        break;
5    case 2: // code to be executed if n = 2;
6        break;
7    default: // code to be executed if n doesn't match any cases
8}

1switch(a) {
2  case -1:
3    std::cout << "a == -1" << std::endl;
4  break;
5
6  case 0:
7    std::cout << "a == 0" << std::endl;
8  break;
9
10  default:
11    std::cout << "a is something else" << std::endl;
12}

1switch(expression) {
2   case 1:
3      //equivalent to if(expression == 1){//do someting...}
4      //do something...
5      break; 
6    //if case 1 is true the rest of the statments arn't 
7    //evaluated because of the break
8   case 45:
9      //equivalent to else if(expression == 45){//do someting...}
10      //do something...
11      break;
12    
13   // you can have any number of case statements and default has to be last
14   default :
15      // equivalent to else{//do someting...}
16      //do something...
17}
18
19switch(expression) {
20   case 1:
21      //equivalent to if(expression == 1){//do someting...}
22      //do something...
23   case 45:
24      //equivalent to if(expression == 45){//do someting...}
25      //do something...
26   default :
27      //always runs if there are no breaks in any of the cases
28      //do something...
29}
30
31//modification of answer by Homeless Hoopoe

1// Transfers control to one of the several statements, depending on the 
2//value of a condition.
3switch (variable or an integer expression) {
4     case constant: {
5     	//C++ code
6    	 break;
7     }
8     case constant: {
9     	//C++ code
10     	break;
11     }
12     default: {
13     	//C++ code
14     	break;
15   	 }
16}