Write a program that asks the user for a date in the format mm/dd/yyyy, using a

Question

Write a program that asks the user for a date in the format mm/dd/yyyy, using a custom struct to store the date information entered in memory. The program should call a custom function that adds seven days to the user's date, passing in the data in and out of the custom function using the custom struct for the dates. The program should then print out the original date entered and the date one week later. As always, be sure to format your C code correctly and include meaningful comments to explain what the code does and how it works.

Explanation / Answer

#include<stdio.h>

struct date//structure declaration
{
   int day,month,year;//date,month,year;
};
void addseven(struct date d)//function which adds 7 to present date and prints to stdout
{
   int m[] ={31,28,31,30,31,30,31,31,30,31,30,31};//array to keep track of days in month
  
   d.day = d.day+7;//incrementing days
   if(d.day>m[d.month-1])//if exceeds monthly days limit then
   {
       int k=d.day-m[d.month-1];
       d.day = k;
       d.month = d.month+1;//increment month count
       if(d.month>12)//if month exceeded 12
       {
           d.year =d.year+1;//incrementing year
           d.month=1;  
       }
      
      
   }
  
   //printing result
   printf("Date after one week : %d/%d/%d ",d.month,d.day,d.year);
}

int main()
{
   struct date present;//present date
  
   char c[10];
   printf("Enter date in format(mm/dd/yyyy) :");
  
   scanf("%s",c);//reading as string
  
   int i=0,k=0,l,s=0;
   for(i=0;c[i]!='';i++)//converting to integer... and storing in structure
   {
      
       if(c[i]=='/' && k==0)
       {
           k=1;
           present.month = s;//storing month
           s=0;
       }
       else if   (c[i]=='/' && k==1)
       {
           k=2;
           present.day = s;//storing day
           s=0;
       }
       else {
       l = (int)c[i]-48;
       s =s*10+l;}
      
   }
   present.year =s;//storing year
  
   //printing present date
   printf("present date : %d/%d/%d ",present.month,present.day,present.year);
  
   addseven(present);//function calling
  
   return 0;
}

/*
ouput:-
Enter date in format(mm/dd/yyyy) :12/1/1994
present date : 12/1/1994
Date after one week : 12/8/1994

Process exited normally.
Press any key to continue . . .

Enter date in format(mm/dd/yyyy) :11/28/1994
present date : 11/28/1994
Date after one week : 12/5/1994

Process exited normally.
Press any key to continue . . .

Enter date in format(mm/dd/yyyy) :12/30/1994
present date : 12/30/1994
Date after one week : 1/6/1995

Process exited normally.
Press any key to continue . . .

*/

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