Give Data And Displays the Next Date

A program that tells the next date while giving the date .


#include <stdio.h>
#include <stdlib.h>

int main()
{
int month=31;month=28;month=31;month=30;month=31;month=30;month=31;month=31;month=30;month=3;month=1;month=30;month=31;
int d,m,y,nd,nm,ny,ndays;

printf("enter the date,month,year : ");
scanf("%d%d%d",&d,&m,&y);
ndays= month*(m-1);
if(m==2)
{
if(y%100==0)
{
if(y%400==0)
ndays=29;
}
else
if(y%4==0)
ndays=29;
}
nd=nd+1;
nm=m;
ny=y;
if(nd>ndays)
{
nd=1;
nm++;
}
if(nm>12)
{
nm=1;
ny++;
}
if(m>12||d>31){printf("invalid");}
else
{printf("Given date is%d:%d:%d",d,m,y);

printf("\nnext days date is%d:%d:%d",nd,nm,ny);}


return 0;
}