printf函数中,%用于格式控制,如果想输出文本%,需要使用两个百分号,即%%。
示例如下:
char car = 'a';
const char *firstday = &car;
const char *seconday = &car;
printf("%%d/t%d, %d/n", firstday, seconday);
printf("%%p/t%p, %p/n", firstday, seconday);
printf("%%#d/t%#p, %#p/n", firstday, seconday);