Mixing
Binary search has index out of range exception but worked before
I am having this problem ,I get index out of range exception on this code for reason unknown. I have list of students that are converted to array and then I return the info for the students in type of String. getFN is returning the Faculty Number (int) . The list is working fine, can it be because I have too little elements into it?
the exception is on this line:
error --> if (item > data[mid].getFN())
public string BinarySearch(int item)
{
int min = 0;
int N = myList.ToArray().Length;
int max = N - 1;
Student data = myList.ToArray();
do
{
int mid = (min + max) / 2;
if (item > data[mid].getFN())
min = mid + 1;
else
max = mid - 1;
if (data[mid].getFN() == item)
return data[mid].toString();
} while (min <= max);
return "Not found. ";
}
c# exception console-application
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
add a comment |
I am having this problem ,I get index out of range exception on this code for reason unknown. I have list of students that are converted to array and then I return the info for the students in type of String. getFN is returning the Faculty Number (int) . The list is working fine, can it be because I have too little elements into it?
the exception is on this line:
error --> if (item > data[mid].getFN())
public string BinarySearch(int item)
{
int min = 0;
int N = myList.ToArray().Length;
int max = N - 1;
Student data = myList.ToArray();
do
{
int mid = (min + max) / 2;
if (item > data[mid].getFN())
min = mid + 1;
else
max = mid - 1;
if (data[mid].getFN() == item)
return data[mid].toString();
} while (min <= max);
return "Not found. ";
}
c# exception console-application
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
1
If the list is empty, then you will always get an error when you try to retrieve an item.
– Dennis_E
Nov 21 '18 at 22:17
add a comment |
I am having this problem ,I get index out of range exception on this code for reason unknown. I have list of students that are converted to array and then I return the info for the students in type of String. getFN is returning the Faculty Number (int) . The list is working fine, can it be because I have too little elements into it?
the exception is on this line:
error --> if (item > data[mid].getFN())
public string BinarySearch(int item)
{
int min = 0;
int N = myList.ToArray().Length;
int max = N - 1;
Student data = myList.ToArray();
do
{
int mid = (min + max) / 2;
if (item > data[mid].getFN())
min = mid + 1;
else
max = mid - 1;
if (data[mid].getFN() == item)
return data[mid].toString();
} while (min <= max);
return "Not found. ";
}
c# exception console-application
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
I am having this problem ,I get index out of range exception on this code for reason unknown. I have list of students that are converted to array and then I return the info for the students in type of String. getFN is returning the Faculty Number (int) . The list is working fine, can it be because I have too little elements into it?
the exception is on this line:
error --> if (item > data[mid].getFN())
public string BinarySearch(int item)
{
int min = 0;
int N = myList.ToArray().Length;
int max = N - 1;
Student data = myList.ToArray();
do
{
int mid = (min + max) / 2;
if (item > data[mid].getFN())
min = mid + 1;
else
max = mid - 1;
if (data[mid].getFN() == item)
return data[mid].toString();
} while (min <= max);
return "Not found. ";
}
c# exception console-application
c# exception console-application
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
asked Nov 21 '18 at 22:11
Jatos DetkingJatos Detking
34
34
1
If the list is empty, then you will always get an error when you try to retrieve an item.
– Dennis_E
Nov 21 '18 at 22:17
add a comment |
1
If the list is empty, then you will always get an error when you try to retrieve an item.
– Dennis_E
Nov 21 '18 at 22:17
1
1
If the list is empty, then you will always get an error when you try to retrieve an item.
– Dennis_E
Nov 21 '18 at 22:17
If the list is empty, then you will always get an error when you try to retrieve an item.
– Dennis_E
Nov 21 '18 at 22:17
add a comment |
1 Answer
1
active
oldest
votes
You are trying to access the array data at a specific index; '0' to get the first item, '1' for the next etc.
On that line where you see the error, you are trying to access the array at the index of mid, whatever value it is at that time. The error is telling you that there is no value at that index.
Maybe the array is empty, maybe your math is causing you to read an index higher than the last entry in the array.
Put a breakpoint on that line, and then mouseover mid to see what index you are trying to read, and over data to see what's in the array. You should see what's happening.
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
add a comment |
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1 Answer
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active
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1 Answer
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active
oldest
votes
active
oldest
votes
active
oldest
votes
You are trying to access the array data at a specific index; '0' to get the first item, '1' for the next etc.
On that line where you see the error, you are trying to access the array at the index of mid, whatever value it is at that time. The error is telling you that there is no value at that index.
Maybe the array is empty, maybe your math is causing you to read an index higher than the last entry in the array.
Put a breakpoint on that line, and then mouseover mid to see what index you are trying to read, and over data to see what's in the array. You should see what's happening.
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
add a comment |
You are trying to access the array data at a specific index; '0' to get the first item, '1' for the next etc.
On that line where you see the error, you are trying to access the array at the index of mid, whatever value it is at that time. The error is telling you that there is no value at that index.
Maybe the array is empty, maybe your math is causing you to read an index higher than the last entry in the array.
Put a breakpoint on that line, and then mouseover mid to see what index you are trying to read, and over data to see what's in the array. You should see what's happening.
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
add a comment |
You are trying to access the array data at a specific index; '0' to get the first item, '1' for the next etc.
On that line where you see the error, you are trying to access the array at the index of mid, whatever value it is at that time. The error is telling you that there is no value at that index.
Maybe the array is empty, maybe your math is causing you to read an index higher than the last entry in the array.
Put a breakpoint on that line, and then mouseover mid to see what index you are trying to read, and over data to see what's in the array. You should see what's happening.
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
You are trying to access the array data at a specific index; '0' to get the first item, '1' for the next etc.
On that line where you see the error, you are trying to access the array at the index of mid, whatever value it is at that time. The error is telling you that there is no value at that index.
Maybe the array is empty, maybe your math is causing you to read an index higher than the last entry in the array.
Put a breakpoint on that line, and then mouseover mid to see what index you are trying to read, and over data to see what's in the array. You should see what's happening.
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
answered Nov 21 '18 at 22:48
JonathanJonathan
2,76921630
2,76921630
add a comment |
add a comment |
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1
If the list is empty, then you will always get an error when you try to retrieve an item.
– Dennis_E
Nov 21 '18 at 22:17