In C++ How can I tell the difference between integers and characters?

[Robertss]

I am currently learning C++ and I have been asked to make a program which will calculate the interest that would be paid on a deposit of a given size. One of the requirements is that we display an error message when non-integer data is entered.

I however cannot work out how to detect if non-integer data has been entered. If anyone could provide an example of how this problem is solved it would be much appreciated!

 

[alexan_e]

How about https://www.cplusplus.com/reference/cctype/

 

[rohitkhanna]

By non-integer do you by any chance mean non-numeric ?

If so, all you need to do is check if your entered ascii character lies within 0x30 -0x39. These being the codes for key press 0..9

 

[ahmad1954]

try this:
int a
if(!(cin>>a))
cout<<"error"
else if . . . .