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C.S.P0039.c
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C.S.P0039.c
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/*
* Assignment: C.S.P0039
* Requirement: Date validation application
* Author: Dat Tran (HE140517)
*/
#include <stdio.h>
#include <stdlib.h>
typedef struct Date
{
int day;
int month;
int year;
} Date;
/*
* To get integer from standard input while check its validity
*/
int getIntInput(int min, int max)
{
int userInput;
short isValid;
char enterChar;
// check validity of input
while (1)
{
isValid = scanf("%d%c", &userInput, &enterChar);
fflush(stdin);
/* input should be integer number
* and end line with enter character */
if (isValid != 2 || enterChar != '\n')
printf("Invalid input. Please enter an integer number in range of %d to %d.\nTry again: ", min, max);
else if (userInput < min || userInput > max)
printf("Input is Out of Range. Please enter a valid input in range of %d to %d.\nTry again: ", min, max);
else
return userInput;
}
}
/*
* To get 2 characters from standard input while check its validity
* c1: char input
* c2: char input
*/
void getCharInput(char *c1, char *c2)
{
short isValid;
char enterChar;
do
{
printf("Enter 2 character: ");
isValid = scanf("%c%c%c", *(&c1), *(&c2), &enterChar);
fflush(stdin);
// 65 - 90 97 - 122
if (isValid != 3 || enterChar != '\n')
printf("Invalid input. Please enter just only 2 character.\n");
else
break;
} while (isValid != 3 || enterChar != '\n');
}
/*
* Check input year (as parameter) either is leap year or not
* Date date: day, month, year input
* Returns: 1 - if input is a leap year
* 0 - if it not
*/
int checkLeapYear(Date date)
{
/* A leap year is a year that divisible by 400 or divisible by 4
* and indivisible by 100. If it is a leap year,
* then return 1, otherwise return 0 */
if (date.year % 400 == 0 || date.year % 4 == 0 && date.year % 100 != 0)
return 1;
else
return 0;
}
/*
* Get date info from user input
* While checking it is in valid type of date or not
*/
void getDateInfo(Date *date)
{
printf("Enter day (1 - 31): ");
date->day = getIntInput(1, 31);
printf("Enter month (1 - 12): ");
date->month = getIntInput(1, 12);
printf("Enter year (1 - 9999): ");
date->year = getIntInput(1, 9999);
}
/*
* Calculating that type of dat which user inputted does it exist or not
* Date date: day, month, year input
*/
void processDateInfo(Date date)
{
char errorMsg[] = "\nDay, month, year you entered is invalid\n";
char successMsg[] = "\nYou entered a valid date: ";
if (date.month == 1 || date.month == 3 || date.month == 5 || date.month == 7 || date.month == 8 || date.month == 10 || date.month == 12)
{
if (date.day <= 31)
printf("%s%d-%d-%d\n", successMsg, date.day, date.month, date.year);
else
printf("%s", errorMsg);
}
else if (date.month == 2)
{
if (checkLeapYear(date.year))
if (date.day <= 29)
printf("%s%d-%d-%d\n", successMsg, date.day, date.month, date.year);
else
printf("%s", errorMsg);
else if (date.day <= 28)
printf("%s%d-%d-%d\n", successMsg, date.day, date.month, date.year);
else
printf("%s", errorMsg);
}
else
{
if (date.day <= 30)
printf("%s%d-%d-%d\n", successMsg, date.day, date.month, date.year);
else
printf("%s", errorMsg);
}
}
/*
* To print out the menu to the console
*/
void getUserChoice(int *userChoice)
{
printf("MENU\n---------------------------\n\n");
printf("1- Processing date data\n");
printf("2- Character data\n");
printf("3- Quit\n");
printf("Enter your choice: ");
*userChoice = getIntInput(1, 3);
}
/*
* Printing output in descending orders of ASCII codes of all characters
* between the 2 inputted characters (inclusively) to standard output
*/
void printCharactersData(char c1, char c2)
{
int i;
printf("Converting characters to ASCII Code:\n");
/* to print out characters and
* its corresponding ASCII terms
* in Descending order */
if (c1 < c2)
for (i = c2; i >= c1; i--)
printf(" %c:%d\n", i, i);
else
for (i = c1; i >= c2; i--)
printf(" %c:%d\n", i, i);
}
/*
* To rerun program as soon as it be invoked
*/
void rerunProgram()
{
fflush(stdin);
printf("\n");
main();
}
int main()
{
int userChoice;
char c1, c2;
Date date;
// prompt user to get their choice then performing corresponding function
getUserChoice(&userChoice);
switch (userChoice)
{
case 1:
// asks users to input date, month and year
// then checks its validity
getDateInfo(&date);
// check does inputted date info be exist or not
// then print out result
processDateInfo(date);
break;
case 2:
// asks users to input 2 characters
// then checks its validity
getCharInput(&c1, &c2);
// outputs in descending orders of ASCII codes
// of all characters between 2 inputted characters
printCharactersData(c1, c2);
break;
case 3:
exit(0);
}
// after finishing option 1 or 2
// then rerun program to display the menu
rerunProgram();
return 0;
}