实验1

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


/*提示休息日*/
#include<stdio.h>
int main()
{
    int days;
    printf("输入一个整数");
    scanf("%d",&days);
    if (days>=1&&days<=5)
    printf("working days,fighting");
    else if(days==6||days==7)
    printf("weekend,relax");
    else
    printf("ooops,notin1to7");
    return 0;
    
    
 }

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