Number Swap Using Pointer

#include <stdio.h>
#include <math.h>
#include <string.h>

void swapp(char *p, char *q)
{
    int swa;
    swa = *p;
    *p = *q;
    *q = swa;
}


int main()
{
    char ch1[10];
    char ch2[10];

    int num1 , num2;

    scanf("%d %d", &num1, &num2);
    //printf("%d %d\n", num1, num2);

    swapp(&num1, &num2);

    printf("%d %d\n", num1, num2);

    return 0;
}