Whats wrong with my code? It says that the switch (a) is wrong and is a undeclar

Question

Whats wrong with my code? It says that the switch (a) is wrong and is a undeclarable identifier of 'a'

#include <iostream>

using namespace std;

int main ()

{

switch(a)

{

case 1:

cout << "Got a ONE" << endl;

case 3:

cout << "Got a THREE" << endl;

break;

case 5:

cout << "Got a FIVE" << endl;

break;

case 7:

cout << "Got a SEVEN" << endl;

break;

case 9:

cout << "Got a NINE" << endl;

break;

case (a % 2 == 0):

cout << " Got an EVEN NUMBER" << endl;

break;

case ( a % 2! = 0):

cout << " Got an NON DIGIT" << endl;

break;

   default:

cout << " Got an Invalid Number" << endl;

break;

}}

Explanation / Answer

Any variable cannot be used unless it is declared.

ERROR 1: In your code, variable 'a' has not been declared.

To use switch function, variable 'a' must contain some value. The value of the variable can be given statically (or) dynamically.

ERROR 2: variable has no value.

static-value is given by the programmer

dynamic - value is taken from the user.

ERROR 3: variable should not appear in constant-expressions like case (a%2 == 0):

Instead if conditional statements can be used.

Check out the code below, dynamic code.

#include <iostream>
using namespace std;
int main (){
   int a;
   cout<<"Enter value of a: ";
   cin>>a;
switch(a){
case 1:
cout << "Got a ONE" << endl;
break;
  
case 3:
cout << "Got a THREE" << endl;
break;
  
case 5:
cout << "Got a FIVE" << endl;
break;
  
case 7:
cout << "Got a SEVEN" << endl;
break;
  
case 9:
cout << "Got a NINE" << endl;
break;
  
default:
   if(a%2 == 0)
       cout << " Got an EVEN NUMBER" << endl;
   else if(a%2 != 0)
       cout << " Got an NON DIGIT" << endl;
   else
   cout << " Got an Invalid Number" << endl;
break;
  
}
}

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