Multiple Case Identifiers

[Si_Bateson]

at the moment ive got this code for a menu

void processchoice(char choice)
{
	switch(choice){
	
	case 'A': {
			cout<<"A";
			break;
			};
	case 'M': {
			cout<<"M";
			break;
			}
	case 'I': {
			cout<<"I";
			break;
			};
	case 'C': {
			cout<<"C";
			break;
			};
	case 'E': {
			cout<<"E";
			break;
			};
	default: {
			cout<<"Invalid Choice";
			break;
			 };
	};
}

but i want to be able to use lower case letters aswell as upper how ...... Help Pls