Moving array elements to the left
Writing a code that shifts array elements left by an int n (keyboard input) and replaces space with zeros.
Ex. int data = { -1, 1, 3, 7, 5} and I want to see { 3, 7, 5, 0, 0}.
Suppose I have:
public static void shiftLeft( int data, int n )
{
System.arraycopy( data, 1, data, 0, data.length - 1 );
data[data.length - 1] = 0;
}
Any quick help would be great.
java arrays
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
add a comment |
Writing a code that shifts array elements left by an int n (keyboard input) and replaces space with zeros.
Ex. int data = { -1, 1, 3, 7, 5} and I want to see { 3, 7, 5, 0, 0}.
Suppose I have:
public static void shiftLeft( int data, int n )
{
System.arraycopy( data, 1, data, 0, data.length - 1 );
data[data.length - 1] = 0;
}
Any quick help would be great.
java arrays
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
You are not usingn. You've hard-coded1instead.
– Johnny Mopp
Nov 12 '18 at 18:11
add a comment |
Writing a code that shifts array elements left by an int n (keyboard input) and replaces space with zeros.
Ex. int data = { -1, 1, 3, 7, 5} and I want to see { 3, 7, 5, 0, 0}.
Suppose I have:
public static void shiftLeft( int data, int n )
{
System.arraycopy( data, 1, data, 0, data.length - 1 );
data[data.length - 1] = 0;
}
Any quick help would be great.
java arrays
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
Writing a code that shifts array elements left by an int n (keyboard input) and replaces space with zeros.
Ex. int data = { -1, 1, 3, 7, 5} and I want to see { 3, 7, 5, 0, 0}.
Suppose I have:
public static void shiftLeft( int data, int n )
{
System.arraycopy( data, 1, data, 0, data.length - 1 );
data[data.length - 1] = 0;
}
Any quick help would be great.
java arrays
java arrays
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
edited Nov 12 '18 at 18:19
Gayan Mettananda
780510
780510
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
asked Nov 12 '18 at 18:07
KoopaMarkley
1710
1710
You are not usingn. You've hard-coded1instead.
– Johnny Mopp
Nov 12 '18 at 18:11
add a comment |
You are not usingn. You've hard-coded1instead.
– Johnny Mopp
Nov 12 '18 at 18:11
You are not using
n. You've hard-coded 1 instead.– Johnny Mopp
Nov 12 '18 at 18:11
You are not using
n. You've hard-coded 1 instead.– Johnny Mopp
Nov 12 '18 at 18:11
add a comment |
1 Answer
1
active
oldest
votes
You were close, but your srcPos argument should be n and the length argument should be data.length - n. You can then use the overloaded Arrays#fill method that accepts a start/end index to fill the rest of the array with 0:
public static void shiftLeft(int data, int n) {
System.arraycopy(data, n, data, 0, data.length - n);
Arrays.fill(data, data.length - n, data.length, 0);
}
Testing this with your example input yields the following:
int data = { -1, 1, 3, 7, 5};
shiftLeft(data, 2);
System.out.println(Arrays.toString(data));
Output:
[3, 7, 5, 0, 0]
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You were close, but your srcPos argument should be n and the length argument should be data.length - n. You can then use the overloaded Arrays#fill method that accepts a start/end index to fill the rest of the array with 0:
public static void shiftLeft(int data, int n) {
System.arraycopy(data, n, data, 0, data.length - n);
Arrays.fill(data, data.length - n, data.length, 0);
}
Testing this with your example input yields the following:
int data = { -1, 1, 3, 7, 5};
shiftLeft(data, 2);
System.out.println(Arrays.toString(data));
Output:
[3, 7, 5, 0, 0]
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
add a comment |
You were close, but your srcPos argument should be n and the length argument should be data.length - n. You can then use the overloaded Arrays#fill method that accepts a start/end index to fill the rest of the array with 0:
public static void shiftLeft(int data, int n) {
System.arraycopy(data, n, data, 0, data.length - n);
Arrays.fill(data, data.length - n, data.length, 0);
}
Testing this with your example input yields the following:
int data = { -1, 1, 3, 7, 5};
shiftLeft(data, 2);
System.out.println(Arrays.toString(data));
Output:
[3, 7, 5, 0, 0]
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
add a comment |
You were close, but your srcPos argument should be n and the length argument should be data.length - n. You can then use the overloaded Arrays#fill method that accepts a start/end index to fill the rest of the array with 0:
public static void shiftLeft(int data, int n) {
System.arraycopy(data, n, data, 0, data.length - n);
Arrays.fill(data, data.length - n, data.length, 0);
}
Testing this with your example input yields the following:
int data = { -1, 1, 3, 7, 5};
shiftLeft(data, 2);
System.out.println(Arrays.toString(data));
Output:
[3, 7, 5, 0, 0]
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
You were close, but your srcPos argument should be n and the length argument should be data.length - n. You can then use the overloaded Arrays#fill method that accepts a start/end index to fill the rest of the array with 0:
public static void shiftLeft(int data, int n) {
System.arraycopy(data, n, data, 0, data.length - n);
Arrays.fill(data, data.length - n, data.length, 0);
}
Testing this with your example input yields the following:
int data = { -1, 1, 3, 7, 5};
shiftLeft(data, 2);
System.out.println(Arrays.toString(data));
Output:
[3, 7, 5, 0, 0]
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
answered Nov 12 '18 at 18:16
Jacob G.
15.2k52162
15.2k52162
add a comment |
add a comment |
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You are not using
n. You've hard-coded1instead.– Johnny Mopp
Nov 12 '18 at 18:11