我输入程序如下．两次！
main()
{
int monday,day,week;
monday=1;
day='n';
week=(monday+day)/7;
printf("(%d+%d)/7=%d\n",monday,day,week);
}
得到答案15这是商．．显然不对．于是我想到用余数试试
main()
{
int monday,day,week;
monday=1;
day='n';
week=(monday+day)％7;
printf("(%d+%d)％7=%d\n",monday,day,week);
}
得到答案是%d．．这个更错．．
我又想如果main()
{
int monday,day,week1，week;
monday=1;
day='n';
week1=(monday+day)/7;
printf("(%d+%d)/7=%d\n",monday,day,week1);
week=(monday+day)-week1*7;
printf("(%d+%d)-%d*7=%d\n",monday,day,week1,week);　
}
虽然这次答案出来了．．
但是我想问问．为什么(%d+%d)%7=%d\n,monday,day,week);
答案会是％d．．如果是按照符号意思．应该是很括号的和除７的余数就是星期几的答案啊

你的第二种方法是正确的，不过输入%的时候不在英文状态下
而且要打印一个 % , 用 printf("%%");

int main()
{
int monday,day,week;
monday=1;
day='n';
week=(monday+day)%7;
printf("(%d+%d)%%7=%d\n",monday,day,week);

return 0;
}

噢．．谢谢．．
原来是这样啊．．