bsearch on multiple items in struct
-
10-12-2019 - |
Question
Fixed.
include
main()
{
int n;
int i;
char tempMonth[255]; //Used to store the month until checked
scanf("%d", &n);
struct date *list;
list = (struct date *)malloc((n * sizeof(struct date)));
for(i = 0; i < n; i++)
{
scanf("%s %d %d", tempMonth, &list[i].day, &list[i].year);
list[i].month = getMonth(tempMonth);
}
convertFullYear(list, n);
qsort(list, n, sizeof(struct date), (compfn)sortDates);
convertSmallYear(list, n);
for(i = 0; i < n; i++)
{
printf("%s %d %02d\n", months[list[i].month], list[i].day, list[i].year);
}
char *pos = (char*) bsearch(Jan, list, sizeof(list), sizeof(Jan), findJan);
}
As you can see I have put what I think is correct to call bsearch, however if it is right i'm not sure where to go from here.
Solution
If you're searching for a specific date, then use a struct date
as a key:
struct date Jan;
Jan.month = 0;
Jan.year = 00;
Jan.day = 1;
Then you can use your sortDates
function (you should rename it to compareDates
):
struct date* pos = bsearch(
&Jan, /* pointer to the structure above */
list, /* pointer to your array */
n, /* number of elements in your array */
sizeof(struct date), /* size of each element */
(compfn)sortDates /* compare function */
);
See also http://www.cplusplus.com/reference/clibrary/cstdlib/bsearch/ and http://en.cppreference.com/w/cpp/algorithm/bsearch for further examples.
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