boolean method does not behave as expected and returns false when true is expected
0
Here's the code in question:
public boolean validMoveRook(int start, int end) {
int xDif = end[0]-start[0];
int yDif = end[1]-start[1];
if (xDif == 0 ^ yDif == 0) {
int distance;
int direction;
if (xDif == 0) {
distance = Math.abs(yDif);
direction = 1;
}
else {
distance = Math.abs(xDif);
direction = 0;
}
for (int i = distance - 1; i >= 0; i--) {
if (direction == 0) {
int newX = start[0] + utilities.AbsoluteChange(xDif, -i);
if (this.board[newX][start[1]] != FREE) return false;
}
if (direction == 1) {
int newY = start[1] + utilities.AbsoluteChange(yDif, -i);
if (this.board[start[0]][newY] != FREE) return false;
}
if (this.board[start[0]][start[1]] == TURN0_WHITEROOK) {
this.board[start[0]][start[1]] = WHITEROOK;
}
if (this.board[start[0]][start[1]] == TURN0_BLACKROOK) {
this.board[start[0]][start[1]] = BLACKROOK;
}
}
System.out.println("success");
return true;
}
System.out.println("Oh no!");
return false;
}
I'm trying to make a chess game. The issue is that it keeps returning false even when it shouldn't. "success" is printed, but it still returns false. Why is this?
java
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
asked Nov 11 at 3:03
wangmeister
1
|
show 1 more comment
0
Here's the code in question:
public boolean validMoveRook(int start, int end) {
int xDif = end[0]-start[0];
int yDif = end[1]-start[1];
if (xDif == 0 ^ yDif == 0) {
int distance;
int direction;
if (xDif == 0) {
distance = Math.abs(yDif);
direction = 1;
}
else {
distance = Math.abs(xDif);
direction = 0;
}
for (int i = distance - 1; i >= 0; i--) {
if (direction == 0) {
int newX = start[0] + utilities.AbsoluteChange(xDif, -i);
if (this.board[newX][start[1]] != FREE) return false;
}
if (direction == 1) {
int newY = start[1] + utilities.AbsoluteChange(yDif, -i);
if (this.board[start[0]][newY] != FREE) return false;
}
if (this.board[start[0]][start[1]] == TURN0_WHITEROOK) {
this.board[start[0]][start[1]] = WHITEROOK;
}
if (this.board[start[0]][start[1]] == TURN0_BLACKROOK) {
this.board[start[0]][start[1]] = BLACKROOK;
}
}
System.out.println("success");
return true;
}
System.out.println("Oh no!");
return false;
}
I'm trying to make a chess game. The issue is that it keeps returning false even when it shouldn't. "success" is printed, but it still returns false. Why is this?
java
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
asked Nov 11 at 3:03
wangmeister
1
3
What isboard? What isFREE? Please post a Minimal, Complete, and Verifiable example. Also this appears to be a great opportunity to use your debugging skills and figure out what the problem is
– GBlodgett
Nov 11 at 3:05
1
Did you actually meanif (xDif == 0 ^ yDif == 0)?
– nullpointer
Nov 11 at 3:06
board is the 2d array of characters that acts as the chessboard. FREE is just an unobtrusive symbol that is printed in the empty squares. The AbsoluteChange method takes the absolute value of the first value, adds the second value, and then returns that with the original sign.
– wangmeister
Nov 11 at 3:07
What makes you think it is returning false? The fact that theprintlnand thereturn true;are two consecutive lines makes me think that either the printing is happening somewhere else or the method really is returning true
– GBlodgett
Nov 11 at 3:10
1
I would suggest running the code with just the code necessary to call this method and see what happens.
– GBlodgett
Nov 11 at 3:18
|
show 1 more comment
0
0
0
Here's the code in question:
public boolean validMoveRook(int start, int end) {
int xDif = end[0]-start[0];
int yDif = end[1]-start[1];
if (xDif == 0 ^ yDif == 0) {
int distance;
int direction;
if (xDif == 0) {
distance = Math.abs(yDif);
direction = 1;
}
else {
distance = Math.abs(xDif);
direction = 0;
}
for (int i = distance - 1; i >= 0; i--) {
if (direction == 0) {
int newX = start[0] + utilities.AbsoluteChange(xDif, -i);
if (this.board[newX][start[1]] != FREE) return false;
}
if (direction == 1) {
int newY = start[1] + utilities.AbsoluteChange(yDif, -i);
if (this.board[start[0]][newY] != FREE) return false;
}
if (this.board[start[0]][start[1]] == TURN0_WHITEROOK) {
this.board[start[0]][start[1]] = WHITEROOK;
}
if (this.board[start[0]][start[1]] == TURN0_BLACKROOK) {
this.board[start[0]][start[1]] = BLACKROOK;
}
}
System.out.println("success");
return true;
}
System.out.println("Oh no!");
return false;
}
I'm trying to make a chess game. The issue is that it keeps returning false even when it shouldn't. "success" is printed, but it still returns false. Why is this?
java
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
asked Nov 11 at 3:03
wangmeister
1
Here's the code in question:
public boolean validMoveRook(int start, int end) {
int xDif = end[0]-start[0];
int yDif = end[1]-start[1];
if (xDif == 0 ^ yDif == 0) {
int distance;
int direction;
if (xDif == 0) {
distance = Math.abs(yDif);
direction = 1;
}
else {
distance = Math.abs(xDif);
direction = 0;
}
for (int i = distance - 1; i >= 0; i--) {
if (direction == 0) {
int newX = start[0] + utilities.AbsoluteChange(xDif, -i);
if (this.board[newX][start[1]] != FREE) return false;
}
if (direction == 1) {
int newY = start[1] + utilities.AbsoluteChange(yDif, -i);
if (this.board[start[0]][newY] != FREE) return false;
}
if (this.board[start[0]][start[1]] == TURN0_WHITEROOK) {
this.board[start[0]][start[1]] = WHITEROOK;
}
if (this.board[start[0]][start[1]] == TURN0_BLACKROOK) {
this.board[start[0]][start[1]] = BLACKROOK;
}
}
System.out.println("success");
return true;
}
System.out.println("Oh no!");
return false;
}
I'm trying to make a chess game. The issue is that it keeps returning false even when it shouldn't. "success" is printed, but it still returns false. Why is this?
java
java
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
asked Nov 11 at 3:03
wangmeister
1
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
asked Nov 11 at 3:03
wangmeister
1
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
edited Nov 11 at 3:08
Hovercraft Full Of Eels
261k20211317
261k20211317
asked Nov 11 at 3:03
wangmeister
1
asked Nov 11 at 3:03
wangmeister
1
asked Nov 11 at 3:03
wangmeister
1
1
3
What isboard? What isFREE? Please post a Minimal, Complete, and Verifiable example. Also this appears to be a great opportunity to use your debugging skills and figure out what the problem is
– GBlodgett
Nov 11 at 3:05
1
Did you actually meanif (xDif == 0 ^ yDif == 0)?
– nullpointer
Nov 11 at 3:06
board is the 2d array of characters that acts as the chessboard. FREE is just an unobtrusive symbol that is printed in the empty squares. The AbsoluteChange method takes the absolute value of the first value, adds the second value, and then returns that with the original sign.
– wangmeister
Nov 11 at 3:07
What makes you think it is returning false? The fact that theprintlnand thereturn true;are two consecutive lines makes me think that either the printing is happening somewhere else or the method really is returning true
– GBlodgett
Nov 11 at 3:10
1
I would suggest running the code with just the code necessary to call this method and see what happens.
– GBlodgett
Nov 11 at 3:18
|
show 1 more comment
3
What isboard? What isFREE? Please post a Minimal, Complete, and Verifiable example. Also this appears to be a great opportunity to use your debugging skills and figure out what the problem is
– GBlodgett
Nov 11 at 3:05
1
Did you actually meanif (xDif == 0 ^ yDif == 0)?
– nullpointer
Nov 11 at 3:06
board is the 2d array of characters that acts as the chessboard. FREE is just an unobtrusive symbol that is printed in the empty squares. The AbsoluteChange method takes the absolute value of the first value, adds the second value, and then returns that with the original sign.
– wangmeister
Nov 11 at 3:07
What makes you think it is returning false? The fact that theprintlnand thereturn true;are two consecutive lines makes me think that either the printing is happening somewhere else or the method really is returning true
– GBlodgett
Nov 11 at 3:10
1
I would suggest running the code with just the code necessary to call this method and see what happens.
– GBlodgett
Nov 11 at 3:18
3
3
What is
board? What is FREE? Please post a Minimal, Complete, and Verifiable example. Also this appears to be a great opportunity to use your debugging skills and figure out what the problem is– GBlodgett
Nov 11 at 3:05
What is
board? What is FREE? Please post a Minimal, Complete, and Verifiable example. Also this appears to be a great opportunity to use your debugging skills and figure out what the problem is– GBlodgett
Nov 11 at 3:05
1
1
Did you actually mean
if (xDif == 0 ^ yDif == 0) ?– nullpointer
Nov 11 at 3:06
Did you actually mean
if (xDif == 0 ^ yDif == 0) ?– nullpointer
Nov 11 at 3:06
board is the 2d array of characters that acts as the chessboard. FREE is just an unobtrusive symbol that is printed in the empty squares. The AbsoluteChange method takes the absolute value of the first value, adds the second value, and then returns that with the original sign.
– wangmeister
Nov 11 at 3:07
board is the 2d array of characters that acts as the chessboard. FREE is just an unobtrusive symbol that is printed in the empty squares. The AbsoluteChange method takes the absolute value of the first value, adds the second value, and then returns that with the original sign.
– wangmeister
Nov 11 at 3:07
What makes you think it is returning false? The fact that the
println and the return true; are two consecutive lines makes me think that either the printing is happening somewhere else or the method really is returning true– GBlodgett
Nov 11 at 3:10
What makes you think it is returning false? The fact that the
println and the return true; are two consecutive lines makes me think that either the printing is happening somewhere else or the method really is returning true– GBlodgett
Nov 11 at 3:10
1
1
I would suggest running the code with just the code necessary to call this method and see what happens.
– GBlodgett
Nov 11 at 3:18
I would suggest running the code with just the code necessary to call this method and see what happens.
– GBlodgett
Nov 11 at 3:18
|
show 1 more comment
1 Answer
1
active
oldest
votes
0
As @Gblodgett pointed out, it's quite possible that you have a Sop("success") in your utilities.AbsoluteChange method and the false is being returned just after that call.
answered Nov 11 at 3:16
Sajal Preet Singh
220110
add a comment |
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As @Gblodgett pointed out, it's quite possible that you have a Sop("success") in your utilities.AbsoluteChange method and the false is being returned just after that call.
answered Nov 11 at 3:16
Sajal Preet Singh
220110
add a comment |
0
As @Gblodgett pointed out, it's quite possible that you have a Sop("success") in your utilities.AbsoluteChange method and the false is being returned just after that call.
answered Nov 11 at 3:16
Sajal Preet Singh
220110
add a comment |
0
0
0
As @Gblodgett pointed out, it's quite possible that you have a Sop("success") in your utilities.AbsoluteChange method and the false is being returned just after that call.
answered Nov 11 at 3:16
Sajal Preet Singh
220110
As @Gblodgett pointed out, it's quite possible that you have a Sop("success") in your utilities.AbsoluteChange method and the false is being returned just after that call.
answered Nov 11 at 3:16
Sajal Preet Singh
220110
answered Nov 11 at 3:16
Sajal Preet Singh
220110
answered Nov 11 at 3:16
Sajal Preet Singh
220110
answered Nov 11 at 3:16
Sajal Preet Singh
220110
220110
add a comment |
add a comment |
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3
What is
board? What isFREE? Please post a Minimal, Complete, and Verifiable example. Also this appears to be a great opportunity to use your debugging skills and figure out what the problem is– GBlodgett
Nov 11 at 3:05
1
Did you actually mean
if (xDif == 0 ^ yDif == 0)?– nullpointer
Nov 11 at 3:06
board is the 2d array of characters that acts as the chessboard. FREE is just an unobtrusive symbol that is printed in the empty squares. The AbsoluteChange method takes the absolute value of the first value, adds the second value, and then returns that with the original sign.
– wangmeister
Nov 11 at 3:07
What makes you think it is returning false? The fact that the
printlnand thereturn true;are two consecutive lines makes me think that either the printing is happening somewhere else or the method really is returning true– GBlodgett
Nov 11 at 3:10
1
I would suggest running the code with just the code necessary to call this method and see what happens.
– GBlodgett
Nov 11 at 3:18