user input handling 1

[holidayIT]

i may have a very simple question, please forgive me if this is a newbie question.

i have a menu that uses an int that i cin and then uses a switch to determine the course of action. how can i prevent or handle the user entering a char? i already am using cin.good() to determine that they entered anything at all, but i need to make sure they are entering a valid int.

is there an easy way to do this?

this is a console app

 

[timmay3141]

When you enter a char, cin puts some very large negative number in the int, apparently some kind of error code. This means that all you have to do is make sure the int is between 1 and however many menu items you have, ie

int sel;
cin >> sel;
while(sel < 0 || sel > MENU_ITEM_COUNT)
{
cout << "Please enter a valid selection";
cin >> sel;
}

switch(sel)
{
// do stuff here
}

 

[holidayIT]

wow...that's almost too easy. thanks.

 

[holidayIT]

do you know of any way i can check just a variable that i store in a class if it is a double or not?

 

[rossno]

Q1. A classic way to process a switch statement is something like:

...
cout << your choices are: ... [whatever] << endl;

while ((choice = cin.get()) != EOF)
{
switch (choice)
{
case 'A': //do something when a is found
break;

case 22:
case 73: // do something when 22 or 73 is found
break;

case 'Z': // do something when Z is found
break;

default: cout << "hey dummy, enter a valid choice!"
}
}
...

Q2. to determine a var type, read up on <typeinfo>

gooooood luck,

norm