#include <stdio.h>
int main(){
      int num;
      printf("Enter an integer you want to check: ");
      scanf("%d",&num);
      if((num%2)==0)      /* Checking whether remainder is 0 or not. */
           printf("%d is even.",num);
      else
           printf("%d is odd.",num);
      return 0;
}
也可以用条件运算符解决：
#include <stdio.h>
int main(){
    int num;
    printf("Enter an integer you want to check: ");
    scanf("%d",&num);
    ((num%2)==0) ? printf("%d is even.",num) : printf("%d is odd.",num);
    return 0;

噢噢噢噢噢噢！

我也要努力啦