How do I add a capital 'N' to the end of my loop so if the user clicks N or n then we will not continue?:

do{

}while (con!='n');
while (con!='n' && con!='N');

or use the library and worry about only one :

#include <cctype> 
//..
int main(){
 //...
 do{
 }while( tolower(con) != 'n'); //similarly you can do "while( toupper(con) != 'N');
}
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