第一次实验作业

#include <stdio.h>
int main(){
    int x;
    printf("输入一个整数：\n");
    scanf("%d",&x);
    if(x%2!=0)
    printf("是奇数");
    else
    printf("是偶数");
    return 0;
} 

#include <stdio.h>
int main(){
    int days;
    printf("输入一个整数:\n");
    scanf("%d",&days);
    if(days>=1&&days<=5)
    printf("workdays,fighting\n");
    else if(days==6||days==7)
    printf("weekend,relax~\n");
    else
    printf("Oops,not in 1~7\n");
    return 0;
}

#include <stdio.h>
int main(){
    char ch;
    printf("输入一个字符\n");
    scanf("%c",&ch);
    if(ch>='a'&&ch<='z');
    ch=ch-32;
    printf("%c\n",ch);
    return 0; 
}