实验一

 

//程序功能：
//要求客户从键盘输入一个整数，判断其是奇是偶
#include <stdio.h>
int main(){
    int x;
    printf("输入一个整数：\n");
    scanf("%d",&x);
    if(x%2==0)
    printf("是偶数");
    else
    printf("是奇数");
    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("Ooops,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-'a'+'A';
        
        printf("%c\n",ch);
        
        return 0; 
}