实验1 C语言开发环境...

#include<stdio.h>
int main(){
    int days;
    printf("输入一个整数:\n") ;
    scanf("%d",&days);
    if(days<=5)
    printf("是工作日");
    else
    printf("非工作日");
    return 0; 
    
}

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

/*判断奇偶*/
# 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;
}