实验1 C 语言开发环境使用和数据类型、运算符、表达式

# include <stdio.h>                                
int main()
{
    int x;
    printf("x:\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("days:\n");
    scanf("%d",&days);
    if(days-6<0)
    printf("workdays,fighting\n");
    else if(days-8<0)
    printf("weekend,relax~\n");
    else
    printf("Ooops,not in 1~7\n");
    return 0;
 } 

# include <stdio.h>
int main()
{
    char ch;
    printf("ch:\n");
    scanf("%c",&ch);
    if(ch<=90)
    printf("%c\n",ch);
    else
    ch=ch-32;
    printf("%c\n",ch);
    return 0;
 }