C program - Finding today date according to user input 

Pic. reference - http://41.media.tumblr.com/ec1e2865d914521ded388fbcc447791c/tumblr_inline_nu6vqczp8y1tbt8rv_400.png




#include<stdio.h>        //Start Program

void main()
{
 int date,elapsed_days,future_day;     //Declare the variables.
 printf("Enter an integer for today date of week = ");   //Ask the user to enter integer for today.
 scanf("%d", &date);
 
 if (date < 7)        //There are 7 days in week, if user inputs wrong, it should show an error message.
 {
  printf("Enter the number of days since elapsed today = "); //Input the days elasped since today.
  scanf("%d", &elapsed_days);
  future_day = (date + elapsed_days) % 7;    //Find Future day.
  switch (date)       //Print the message according to input.
  {
  case 0:        // Two ways of writing program are switch and with if else.
   printf("Today is Sunday");
   break;
  case 1:
   printf("Today is Monday");
   break;
  case 2:
   printf("Today is Tuesday");
   break;
  case 3:
   printf("Today is Wednesday");
   break;
  case 4:
   printf("Today is Thursday");
   break;
  case 5:
   printf("Today is Friday");
   break;
  case 6:
   printf("Today is Saturday");
   break;
  default:
   printf("Invalid Input.");
   break;

  }
  if (future_day == 0)     //Print the future day according to user input.
   printf(" and Future day is Sunday.");
  else if (future_day == 1)
   printf(" and Future day is Monday.");
  else if (future_day == 2)
   printf(" and Future day is Tuesday.");
  else if (future_day == 3)
   printf(" and Future day is Wednesday.");
  else if (future_day == 4)
   printf(" and Future day is Thursday.");
  else if (future_day == 5)
   printf(" and Future day is Friday.");
  else if (future_day == 6)
   printf(" and Future day is Saturday.");
 }
 else                                                          //Otherwise ask the user to input right integer.
  printf("Please enter the valid number.");
 

 getch();
}         //EndProgram.
































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