SO i got this program date_struct.c going and it looks like everything works except the printout part.
When input 2 dates to get the numbers of days between them nothing happens, the program ends. This also happens when i try inputting a date and an integer, and returns a new date which is the given date, plus the given number of days, again the program ends without printing out the answers.

Can anyone see any errors in my code?

#include <stdio.h> 
#include <time.h> 
#include <string.h> 
#include <stdlib.h> 
struct mydate { 
int day; 
int month; 
int year; 
}; 
int daysbetween
 
(struct mydate *d1, struct mydate *d2) 
{
struct tm timeptr1 = {0}, timeptr2 = {0};
time_t date1, date2; 
long long diff_t = 0; 
 
timeptr1.tm_mday = d1->day;
timeptr1.tm_mon = d1->month - 1;
timeptr1.tm_year = d1->year - 1900; 
date1 = mktime(&timeptr1); 
timeptr2.tm_mday = d2->day;
timeptr2.tm_mon = d2->month - 1; 
timeptr2.tm_year = d2->year - 1900; 
date2 = mktime(&timeptr2); 
diff_t = (date2 - date1) / (60 * 60 * 24); 
 
return (diff_t); 
} 
 
char *adddays(struct mydate *d1, int days) 
{ 
struct tm timeptr = {0}; time_t date1; 
timeptr.tm_mday = d1->day; 
timeptr.tm_mon = d1->month - 1; 
timeptr.tm_year = d1->year - 1900; 
date1 = mktime(&timeptr); 
date1 = date1 + (days * 24 * 60 * 60); 
return (ctime(&date1)); 
} 
 
struct mydate *getdate() { 
 
struct mydate *d = malloc(sizeof(struct mydate) * 1); 
printf("Enter date (mm/dd/yyyy): "); 
scanf("%d/%d/%d", &(d->month),&(d->day) , &(d->year)); 
return d; 
} 
 
 
main() { 
int choice = 0; 
struct mydate *d1, *d2; 
char str_time[256] = ""; 
int days; 
while ((choice > 3) || (choice < 1)) 
{ 
printf("Date_Struct.c Menu:\n"); 
printf("1. Difference Between two dates\n"); 
printf("2. Add days and give next date\n"); 
printf("3. Exit program\n"); 
printf("\n Enter a number:"); 
scanf("%d", &choice); 
} 
switch (choice) 
{ 
 
case 1: 
printf("Enter first date: \n"); 
d1 = getdate(); 
printf("Enter second date: \n"); 
d2 = getdate(); 
printf("Number of days in between is: %d\n", daysbetween(d1, d2)); 
break; 
 
case 2: 
printf("Enter a date: \n"); 
d1 = getdate(); 
printf("Enter number of days: "); 
scanf("%d", &days); 
strcpy(str_time, adddays(d1, days)); 
printf("Next date is:%s\n", str_time); 
break; 
 
case 3: 
exit (0); 
} 
}

Please add system("pause"); at the end.
So it should loook like this:

...
exit (0); 
} 
system("Pause");
}

Please add system("pause"); at the end.
So it should loook like this:

...
exit (0); 
} 
system("Pause");
}

No, don't. There is no need to call the operating system when the languave itself can pause the program by simply doing a cin statement.

The assumption here is the program window is closing before you can see the output. Is this a true assumption?

No, don't. There is no need to call the operating system when the languave itself can pause the program by simply doing a cin statement.

The assumption here is the program window is closing before you can see the output. Is this a true assumption?

yes that is true assumption

yes that is true assumption

No, it's false asumption! There is no "cin" in C. You shoud use getchar() or similar if you don't want to use system(); i used to it because Dev-cpp is adding it to the end of main function. Later I usually delete it when I'm sure everything works fine.
Real question is: "Does it solve your problem?"

EDIT: It seems like Micko was just a minute too fast. He is right. cin.get() won't work in C.

--------------------old post----------------------
Then add cin.get() at the end of your code (before the return, of course). This will pause your program so you get more time to read the output. It will wait for you to press enter

So the problem was not

When input 2 dates to get the numbers of days between them nothing happens, the program ends....
... again the program ends without printing out the answers.

Did pausing before exit help?

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