同時被2和3整除，能被二者其中之一整除，能被二者之一整除且只能是其中一個整除。

#include <stdio.h>
#include <stdlib.h>

int main()
{
int n;
scanf("%d",&n);
if(n%20&&n%30)
{
printf("%d divisible by 2 and 3?%d\n",n,n%20&&n%30);
}
if(n%20||n%30)
{
printf("%d divisible by 2 or 3?%d\n",n,n%20||n%30);
}
if(!(!(n%20&&n%30)&&(n%20||n%30)))
{
printf("%d divisible by 2 or 3,but not both?%d",n,(!(n%20&&n%30)&&(n%20||n%30)));
}
return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
int n;
scanf("%d",&n);
printf("%d divisible by 2 and 3?%d\n",n,n%20&&n%30);
printf("%d divisible by 2 or 3?%d\n",n,n%20||n%30);
printf("%d divisible by 2 or 3,but not both?%d",n,(!(n%20&&n%30)&&(n%20||n%30)));
return 0;
}