一个关于判断12月31日星期几的函数答://vc6 pass include <stdio.h> char * day[7]={ "Monday","Tuesday","Wednesday","Thursday","Friday","Saturday""Sunday"};int month[12] = { 0,31,31+28,31+28+31,31+28+31+30,31+28+31+30+31,31+28+31+30+31+30,31+28+31+30+31+30+31,31+28+31+30+31+30+31+31...