打卡9.判断一个数的奇偶#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>int main(){    int a ;    printf("输入一个数\n");    scanf("%d", &a);    if (a% 2 == 1)        printf("a为奇数");    else if (a % 2 == 0)        printf("a为偶数");    return 0;}10.输入两个数求最大#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>int main(){    int a=0, b=0;    printf("输入两个数\n");    scanf("%d%d", &a, &b);    if (a > b)        printf("%d\n", a);    else        printf("%d\n", b);    return 0;}11.枚举的认识#include<stdio.h>enum color{    blue,red,green};int main(){    enum color a = red;    printf("%d", a);    return 0;}12.求两数之和#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>int main(){    int a, b;    scanf("%d%d", &a, &b);    int sum;    sum = a + b;    printf("sum=%d", sum);    return 0;}