How do I put in while condition that my viariable must be not a character

Hello;
I am having some little troubles finding out a way to put under my while condition the fact that my variable which is an "int" must be not a character took from an input requested before my while cycle.
While cycle is used to check if the variable wrote in input doesnt match with conditions i need for the algorithm.

What I have tried:

here is an example of code:
#include <stdio.h>

int main(){
int n;
scanf("%d", &n);
while(n<=-1 ){
printf("Incorrect. Write a positive integer.");
scanf("%d", &n);
}


return 0;
}

This is working for numbers, but if in input i write a character like "g" it loopes and i must control+c, blocking it.

Tags: C++