Hi guys im having a slight problem passing the month and year variable to a function that i have created called int totalDays(unsigned year, unsigned month) now when i do a print inside the function it prints 0. Even though i have inputted using a key for example 6 for the month and 2006 for the year.


So pretty much after i have entered the input for month and year it does not carry the value that i have entered into the totalDays function instead its always 0 why is that?


sorry for posting the whole thing but its got something to do with how im passing variables through the function impretty sure.

int main(void)
{
   unsigned  month;
   unsigned  year;
   int i;
   int daysOfMonth[] = {31,28,31,30,31,30,31,31,30,31,30,31};
   
   
   month = getMonth();
   year  = getYear();
  
   displayCalendar(month, year);
   
   /* function call : if its a leap year february is now 29 days instead of 28*/
   if(isLeapYear(year))
   {
      
      daysOfMonth[1] = 29;  /* change feb to 29 days*/
   }
    
   return EXIT_SUCCESS;
}


/**************************************************  **************************
* Function getMonth() prompt the user for a number MIN_MONTH to MAX_MONTH and
* returns that number. The number 0 is valid because this indicates that the
* user wants to select all months.
**************************************************  **************************/
unsigned getMonth()
{
   
   /*** declare variables*/
  
  
  char *prompt = "Please enter a month between 0 - 12 !\n";
  char *month;
  int valMonth;
  int monthValid;
  
  do
  {
  monthValid = TRUE;
  month = getUserInput(prompt);
  
  valMonth = strtod(month,NULL);
  monthValid = validateMonth(valMonth);
  }
  while(!monthValid);
  /*printf("hello %s",month);*/
  /*printf("Please enter a month between 0 - 12\n");*/

 
  /* validation check if month entered is less then 0 > 12*/ 
 
  
  /*doint arr[] = {1,2,3};
  {
        fgets(buff, BUFF_SIZE, stdin);
	
        
	*month = atoi(buff); 
       
	while(flag == 1 || *month <0 || *month >12)
	{
	   flag = 0;
	   
	   printf("Wrong input for month from 0 - 12 only!\n");
	   printf("Please enter a month between 0 - 12\n");
	   
	   fgets(buff, BUFF_SIZE, stdin);
	   *month = atoi(buff); month = getUserInput(prompt, result);
  tmpMonth = validateMonth(valMonth, prompt, result);
	
	}
   
	month
       
	
	                    
	
       
   }
   while(flag != 0 );
          */
        
   
   return EXIT_SUCCESS;

}


/**************************************************  **************************
* Function getYear() prompts the user for a number MIN_YEAR to MAX_YEAR and
* returns that number.
**************************************************  **************************/
unsigned getYear(char *month)
{
   char *prompt = "Please enter the year\n";
   char *year;
   int valYear;
   int yearValid;
   
   do
   {
     year = getUserInput(prompt);
     valYear = strtod(year,NULL);
     yearValid = validateYear(valYear);
     
   }
   while(!yearValid);
   
   return EXIT_SUCCESS;
}


/**************************************************  **************************
* Function displayCalendar() displays the calendar for the user.
* The function will display the calendar for a whole month.
* If the user supplied a month of "0", then a calendar for a whole year
* is displayed instead each month displayed under the previous one (you
* don't need to try to display months side by side).
* Give attention to getting the output format exactly as shown below
* (including headings and alignment). Here's an example for March 2006:
* --------------------
*      March 2006
*  S  M Tu  W Th  F  S
*           1  2  3  4
*  5  6  7  8  9 10 11
* 12 13 14 15 16 17 18
* 19 20 21 22 23 24 25
* 26 27 28 29 30 31
* 
**************************************************  **************************/
void displayCalendar(unsigned month, unsigned year)
{
   /* function called totalDays();*/
   /* total days % 7 finds out how many spaces for each month*/
   /* figure out when to print a new line*/
   int calDays;
   
   calDays = totalDays(month, year);
   
}


/**************************************************  **************************
* Function readRestOfLine() is used for buffer clearing. Source: 
* https://inside.cs.rmit.edu.au/~sdb/teaching/C-Prog/CourseDocuments/
* FrequentlyAskedQuestions/
**************************************************  **************************/
void readRestOfLine()
{
   int c;

   /* Read until the end of the line or end-of-file. */   
   while ((c = fgetc(stdin)) != '\n' && c != EOF);

   /* Clear the error and end-of-file flags. */
   clearerr(stdin);
}

char* getUserInput(char *prompt)
{
   char *result;
   char buff[BUFF_SIZE];
   
   printf(prompt);
   
   result = fgets(buff, BUFF_SIZE, stdin);
   
   
    if(result == NULL)
    {
       
        printf("Error please enter the input again!\n");
   
    }
    else if(result[strlen(result)-1] != '\n')
    {
        readRestOfLine();
    }
    
  
    return result;
   
   
}

int validateMonth(unsigned  month)
{
   
     if(month<0 || month>12) /* flag 1 for true*/
     {
	
        printf("Month error 0 or less or equal to 12 please\n");
	return FALSE;
     }
     
     return TRUE;
     
     /*return 1;*/
}

int validateYear(unsigned year)
{
   
   if(year<0 || year>3000)
   {
      printf("between 0 - 3000 only!!\n");
      return FALSE;
   }
   
   return TRUE;
}

int isLeapYear(unsigned year)
{
   if((year%400 == 0)|| ( year%4==0 && year % 100 != 0))
   {
      
      return TRUE; 
   }
   else
   {
      return FALSE;
   }
  
}

int totalDays(unsigned year, unsigned month)
{

    printf("year is:%d  month is:%d", year, month); 

/******* in here it should print what i have inputted in the month and year but it always gives me 0? why is that?*******/
   
   return EXIT_SUCCESS;
}

Check your getYear() and getMonth() functions. They are not returning the values you want. That is why you are always getting 0.

Also the parameters in the calDays = totalDays(month, year); call are reversed.

In getMonth() and getYear() dont return EXIT_SUCCESS

ok well id want to return the month variable and the year variable so i can pass it wouldnt i?

but then i get a warning saying integer from pointer without a cast?

but then i tried

return *month and it worked but it returned a bogus value for example i typed in 5 for the month and it would return 50 or 60

yehhh i changed return_success to return month i get the warning type cast integer one. But if i go return *month i get a wrong value

yehhh i changed return_success to return month i get the warning type cast integer one. But if i go return *month i get a wrong value

try using

return valMonth;

and

return valYear;

.

i just bet ya too it i returned month n year instead of those values thnks for ur help

i just bet ya too it i returned month n year instead of those values thnks for ur help

#include <stdio.h>
#include <string.h>
#include <ctype.h>
//#include "ansidecl.h"
//#include "safe-ctype.h"
#define TRUE 1
#define FALSE 0
#define EXIT_SUCCESS 0
#define BUFF_SIZE 255







/**************************************************  **************************
* Function readRestOfLine() is used for buffer clearing. Source: 
* https://inside.cs.rmit.edu.au/~sdb/teaching/C-Prog/CourseDocuments/
* FrequentlyAskedQuestions/
**************************************************  **************************/
void readRestOfLine()
{
   int c;

   /* Read until the end of the line or end-of-file. */   
   while ((c = fgetc(stdin)) != '\n' && c != EOF);

   /* Clear the error and end-of-file flags. */
   clearerr(stdin);
}

char* getUserInput(char *prompt)
{
   char *result;
   char buff[BUFF_SIZE];
   unsigned char i;
   unsigned char len;
   
   printf(prompt);
   
   result = fgets(buff, BUFF_SIZE, stdin);
   
   
    if(result == NULL)
    {
       
        printf("Error please enter the input again!\n");
   
    }
    else if(result[strlen(result)-1] != '\n')
    {
        readRestOfLine();
    }
	len = strlen(result);
	for (i=0; i<len-1; i++) //
		if (!isdigit(result[i]))
			return NULL;
  
    return result;
   
   
}

int validateMonth(unsigned  month)
{
   
     if(month<0 || month>12) /* flag 1 for true*/
     {
	
        printf("Month error 0 or less or equal to 12 please\n");
	return FALSE;
     }
     
     return TRUE;
     
     /*return 1;*/
}

/**************************************************  **************************
* Function getMonth() prompt the user for a number MIN_MONTH to MAX_MONTH and
* returns that number. The number 0 is valid because this indicates that the
* user wants to select all months.
**************************************************  **************************/
unsigned getMonth()
{
   
   /*** declare variables*/
  
  
  char *prompt = "Please enter a month between 0 - 12 !\n";
  char *month;
  int valMonth;
  int monthValid = -1;
  
  do
  {
  monthValid = TRUE;
  month = getUserInput(prompt);
  
//  valMonth = strtod(month,NULL);
  if (month)
	valMonth = atoi(month);
  monthValid = validateMonth(valMonth);
  }
  while(!monthValid);
  /*printf("hello %s",month);*/
  /*printf("Please enter a month between 0 - 12\n");*/

 
  /* validation check if month entered is less then 0 > 12*/ 
 
  
  /*doint arr[] = {1,2,3};
  {
        fgets(buff, BUFF_SIZE, stdin);
	
        
	*month = atoi(buff); 
       
	while(flag == 1 || *month <0 || *month >12)
	{
	   flag = 0;
	   
	   printf("Wrong input for month from 0 - 12 only!\n");
	   printf("Please enter a month between 0 - 12\n");
	   
	   fgets(buff, BUFF_SIZE, stdin);
	   *month = atoi(buff); month = getUserInput(prompt, result);
  tmpMonth = validateMonth(valMonth, prompt, result);
	
	}
   
	month
       
	
	                    
	
       
   }
   while(flag != 0 );
          */
        
   
   return valMonth;

}

int validateYear(unsigned year)
{
   
   if(year<0 || year>3000)
   {
      printf("between 0 - 3000 only!!\n");
      return FALSE;
   }
   
   return TRUE;
}

/**************************************************  **************************
* Function getYear() prompts the user for a number MIN_YEAR to MAX_YEAR and
* returns that number.
**************************************************  **************************/
unsigned getYear()
{
   char *prompt = "Please enter the year\n";
   char *year;
   int valYear;
   int yearValid;
   
   do
   {
     year = getUserInput(prompt);
  //   valYear = strtod(year,NULL);
	 if (year)
		valYear = atoi(year);
     yearValid = validateYear(valYear);
     
   }
   while(!yearValid);
   
   return valYear;
}

int totalDays(unsigned year, unsigned month)
{

    printf("year is:%d  month is:%d", year, month); 

/******* in here it should print what i have inputted in the month and year but it always gives me 0? why is that?*******/
   
   return EXIT_SUCCESS;
}

/**************************************************  **************************
* Function displayCalendar() displays the calendar for the user.
* The function will display the calendar for a whole month.
* If the user supplied a month of "0", then a calendar for a whole year
* is displayed instead each month displayed under the previous one (you
* don't need to try to display months side by side).
* Give attention to getting the output format exactly as shown below
* (including headings and alignment). Here's an example for March 2006:
* --------------------
*      March 2006
*  S  M Tu  W Th  F  S
*           1  2  3  4
*  5  6  7  8  9 10 11
* 12 13 14 15 16 17 18
* 19 20 21 22 23 24 25
* 26 27 28 29 30 31
* 
**************************************************  **************************/
void displayCalendar(unsigned month, unsigned year)
{
   /* function called totalDays();*/
   /* total days % 7 finds out how many spaces for each month*/
   /* figure out when to print a new line*/
   int calDays;
   
   calDays = totalDays(month, year);
   
}



int isLeapYear(unsigned year)
{
   if((year%400 == 0)|| ( year%4==0 && year % 100 != 0))
   {
      
      return TRUE; 
   }
   else
   {
      return FALSE;
   }
  
}



int main(void)
{
   unsigned  month;
   unsigned  year;
   int i;
   int daysOfMonth[] = {31,28,31,30,31,30,31,31,30,31,30,31};
   
   
   month = getMonth();
   year  = getYear();
  
   displayCalendar(year, month);
   
   /* function call : if its a leap year february is now 29 days instead of 28*/
   if(isLeapYear(year))
   {
      
      daysOfMonth[1] = 29;  /* change feb to 29 days*/
   }
    
   return EXIT_SUCCESS;
}

Maybe you sholud change

if(month<0 || month>12) /* flag 1 for true*/

to

if(month<=0 || month>12) /* flag 1 for true*/

or

if(month<0 || month>=12) /* flag 1 for true*/

Not tested fully but I think it may work

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