C语言计算某年某月某日 是该年的第几天 for里面因该是i=1；i；i+ include int leap(int year) { int leap1；if(year%400=0|(year%4=0&year%100。0)) leap1=1；else leap1=0；return leap1；} int main() 。
编写计算莫年某月有多少天用C语言 include<；stdio.h>；int main(void){int year，mouth；printf(\"Input year：\")；scanf(\"%d\"，&year)；printf(\"Input mouth：\")；scanf(\"%d\"，&mouth)；switch(mouth){case 1：case 3：case 5：case 7：case 8：case 10：case 12：printf(\"There are 31 days in%d mouth.\\n\"，mouth)；break；case 4：case 6：case 9：case 11：printf(\"There are 30 days in%d mouth.\\n\"，mouth)；break；case 2：if((year%400=0)|(year%4=0&year%100。0))printf(\"There are 29 days in%d mouth.\\n\"，mouth)；elseprintf(\"There are 28 days in%d mouth.\\n\"，mouth)；break；default：printf(\"Input error mouth.\\n\")；break；} return 0；}
C语言计算某年某月某日为该年的第几天 #includevoid main(){int y，m，d；int sum=0；int flog；标识是否是闰年printf(\"请输入年月日(yyyy-mm-dd)\\n\")；scanf(\"%4d-%2d-%2d\"，&y，&m，&d)；if((y%4=0&y%100。0)|y%400=0)flog=1；elseflog=0；while((y)|(m>；12|m)|(d|d>；31)|((m%2=0)&(d=31))|((flog=1)&(m=2)&(d>；28))){printf(\"input errro。\\n\")；printf(\"请输入年月日(yyyy-mm-dd)\\n\")；scanf(\"%4d-%2d-%2d\"，&y，&m，&d)；}switch(m-1){case 12：sum+31；case 11：sum+30；case 10：sum+31；case 9：sum+30；case 8：sum+31；case 7：sum+31；case 6：sum+30；case 5：sum+31；case 4：sum+30；case 3：sum+31；case 2：if(flog=1)/这里改32313133353236313431303231363533e59b9ee7ad9431333337616461一下sum+28；elsesum+30；case 1：sum+31；break；这里加上一个break语句default：printf(\"非法月份\\n\")；break；}sum=sum+d；if(flog=1)printf(\"%d is leap year。\\n\"，y)；printf(\"这一天是这年的第%d天\"，sum)；}
