scanf() for Integer OR Character

Question

So let's say I have a while loop that will end when the condition "isDone" is set to true. Inside the while loop, I ask the user to either enter an integer to continue the loop or a character to end it (by setting "isDone" to true).

How would I go about this using only one scanf()?

Answer 1

The suggestion above is good advice: you're probably better off not using scanf() at all. It might be better to use something like fgets() instead, and then parse the string. Or even better, just use getchar() .

But anyway ...

Remember that, in C, a "character" IS an integer. So just scanf("%c", &i) and check if you've got an "integer" ( isdigit() ) or a "character" ( isalpha() ).