实验一

#include<stdio.h>
int main(){
	int x;
	
	printf("输入一个整数：\n");
	scanf("%d",&x);

if(x%2) 

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");
    return 0;

　　

#include<stdio.h>
int main(){
	char ch;
	
	printf("输入一个字符：\n");
	scanf("%c",&ch);
	if(ch>= 97&&ch<=122)
	ch=ch - 32;
	 
	 printf("%c\n",ch);
	 return 0;