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c语言返回星期几的函数,c语言求几天后是星期几
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c语言计算日期为星期几
#includestdio.h
int isRn(int num){
if((num%4==0num%400!=0)||num%400==0){
return 1;
}else{
return 0;
}
int monthDay(int year,int month){
if(month==1||month==3||month==5
||month==7||month==8||month==10
||month==12){
return 31;
}else if(month==4||month==6||month==9
||month==11)
{
return 30;
}else if(month==2){
if(isRn(int num)==1){
return 29;
}else{
return 28;
}
}
}
void main(){
int sum=0,year,month,day,i,temp,j;
printf("请输入年份：");
scanf("%d",year);
while(year1900){
printf("年份必须从1900年开始！\n\n");
printf("请输入年份：");
scanf("%d",year);
}
printf("请输入月份：");
scanf("%d",month);
while(month1||month12){
printf("月份必须是1到12之间！\n\n");
printf("请输入月份：");
scanf("%d",month);
}
printf("请输入日：");
scanf("%d",day);
while(daymonthDay(year,month)||day1){
printf("日必须从1开始，并且不能大于该月的天数！\n\n");
printf("请输入日：");
scanf("%d",day);
}
temp=month;
temp-=1;
for(i=1900;i=year;i++){
for(j=1;j=12;j++){
if(i==yearj==temp){
break;
}
sum+= monthDay(year,j);
}
}
sum+=day;
printf("%d年%d月%d日，是星期",year,month,day)
if(sum%7==0){
printf("日。\n");
}else if(sum%7==1){
printf("一。\n");
}else if(sum%7==2){
printf("二。\n");
}else if(sum%7==3){
printf("三。\n");
}else if(sum%7==4){
printf("四。\n");
}else if(sum%7==5){
printf("五。\n");
}else if(sum%7==2){
printf("六。\n");
}
}
C语言：输入任意年月日，求该天是星期几？
注意：本源码中，函数GetWeekDay的返回值仅仅表示输入参数是否“正确/有效”（例如前三个参数使用2001，2，29就是无效参数），能否得到预期的星期值；真正的星期值则是通过输出变量返回给主调函数的。
#include
time.h
#include
stdio.h
int
GetWeekDay(int
nYear,int
nMon,int
nDay,
int
*npWeekDay);
int
main()
{
int
nMyWeekDay;
int
nResult;
nResult
=
GetWeekDay(2007,1,10,nMyWeekDay);
return
0;
}
//输入日期，返回星期的C语言函数
int
GetWeekDay(int
nYear,int
nMon,int
nDay,
int
*npWeekDay)
{
int
nRetVal
=
0;
time_t
tMyDateTime;
struct
tm
tmMyDate,*tmpMyDate;
if((nYear1900||nYear=3000)
||
(nMon1
||
nMon12)
||
(nDay1||nDay31)
)
{
nRetVal
=
1;
*npWeekDay
=
-1;
return
nRetVal;
}
//memset(tmMyDate,0,sizeof(struct
tm));
tmMyDate.tm_year
=
nYear-1900;
tmMyDate.tm_mon
=
nMon-1;
tmMyDate.tm_mday
=
nDay;
tmMyDate.tm_hour
=16;
tmMyDate.tm_min
=30;
tmMyDate.tm_sec
=30;
tMyDateTime
=
mktime(tmMyDate);
if(tMyDateTime0)
{
nRetVal
=
1;
*npWeekDay
=
-1;
return
nRetVal;
}
tmpMyDate
=
localtime(tMyDateTime);
*npWeekDay
=
tmpMyDate-tm_wday;
return
nRetVal;
}
c语言:用自定义函数来实现任意输入一个日期，结果输出其星期几
y年m月d日，是第几天days啊？计算方法：days=mon[1]+mon[2]+.+mon[m-1]+d;mon[i]是第i个月的天数；同时要注意，mon[2]闰年29，否则28；给出代码吧，虽然这样对你其实么有什么好处、#includeintmain(){intmon[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};inty,m,d,days;intleap,i;scanf("%d%d%d",y,m,d);for(i=1,days=0;i2)days++;printf("days=%d\n",days);}自己读，自己写，经常百度，不好~~~刚才有个单词打错了，sorry、、~~
