系统测试题51.输入某年某月某日，判断这一天是这一年的第几天？#include main() int day,month,year,sum,leap; printf(nplease input year,month,dayn); scanf(%d,%d,%d,&year,&month,&day); switch(month) case 1:sum=0;break; case 2:sum=31;break; case 3:sum=59;break; /*SPACE*/ case 4:【?】;break; case 5:sum=120;break; case 6:sum=151;break; case 7:sum=181;break; case 8:sum=212;break; case 9:sum=243;break; case 10:sum=273;brea
