4
votes
"Expected expression" error in my Game of Fifteen code
You are using a comparison symbol that does not exist. Change !== with != and that should do the work for the while statement. About the else I can't really help without some more information... Did ...
3
votes
Accepted
Void init(void) or void init(int d)?
The int variable named d is a global variable. Global variables are variables that are declared outside of any functions. They can be accessed from anywhere in the source code file and that's why we ...
- 17.3k
3
votes
Accepted
Game of Fifteen - Move function issue
You have two serious problems here. First, your move() function defines int blank = board[d][d]; The array element board[d][d] doesn't exist because both indexes run from 0 to d-1. Anything with d ...
- 63.1k
3
votes
Accepted
PSET 3: Game of fifteen. Everything in the board is equal to zero
You only need to delete this and the code will work:
int board[d][d];
The reason is that the global variable board is declared above and can be used by any function
int board[DIM_MAX][DIM_MAX];
...
- 1,139
2
votes
Accepted
pset3 fifteen's draw function problem
I just tested your code and got it working with a couple minor tweaks. My advice is to go look back at your global variables. Something you have in both those functions has been declared earlier in ...
- 1,424
2
votes
Accepted
All my moves entered are shown illegal, though code doesn't seem wrong... (PS3 - fifteen)
The thing is:
The program has declared a global variable d already.
//board dimension
int d;
In your program, there's another declaration of d, in your a b c d initialisation.
Thus, your for ...
- 36
2
votes
Accepted
pset3 fifteen - how to check if tile is adjacent to 0/"_"?
Simply put, if tile is in board[i][j], you need to check the positions directly above, below, and on either side for 0. In other words, board[i+1][j], board[i-1][j], board[i][j+1], board[i][j-1].
But ...
- 63.1k
2
votes
Accepted
PSET3 fifteen.c - no idea how to adjust spaces for game board
"Give a man a fish and you feed him for a day. Teach him to fish and you feed him for a lifetime."
You are currently printing out the tile values with %i as the placeholder for the tile in your ...
- 63.1k
2
votes
Accepted
pset3: "fifteen" - should "draw" include "move"?
The reason that it only draws the initialized board is that move() is not swapping any tiles. The code is setting several int vars equal to values in the board[][] array, effectively making copies of ...
- 63.1k
2
votes
Accepted
Why is the code after the for loop not executed?
It probably is executing, but not the way you think. You're lucky it isn't seg faulting. (Well, actually, a seg fault would be better. )
Think about the array indexes that you're using. Remember ...
- 63.1k
2
votes
pset3 fifteen won
You are checking if everything is alright. And if the first part is alright you are returning true right away.
This piece of code is exiting if the second box is correct without checking the rest of ...
2
votes
Accepted
Error: function definition is not allowed here
Simply put, there is a missing closing curly brace, }, in the draw() function. It looks to be missing at the first if statement code block. Because of the mispairing/missing closing curly brace, it ...
- 63.1k
2
votes
fifteen is outputting random numbers
Remember that you already got d from command line input, so there is no need for
d=GetInt()
in init() function.
If on the other hand you are not providing d at command line, that would account for ...
- 1,415
2
votes
Accepted
pset3: Help with Fifteen Move function
I think it's ok to search for both tile and empty tile, though you could maintain global variable(s) to store the position of the empty tile, some even keep track of the positions of all tiles, ...
- 20.7k
2
votes
pset3 fifteen what am I doing wrong with my move function
Resolved!
I was watching week 4s lecture and realised that my swap didn't make sense, I was expecting the program to switch two values at the same time. So I used a temp variable to store the value ...
- 65
2
votes
Accepted
Problems with won function on pset3
You return true too early. You only check whether all the tiles are in the correct order, but you don't check the position of the empty tile. A quick fix would be to replace
if (min == d*d)
{
...
- 20.7k
2
votes
Accepted
How to fix "variable-sized object may not be initialized" error?
It is not complaining about k (which is not a "variable sized object"). It is complaining about grid. The problem is because you are declaring grid here int grid[i][j] = k; by using the keyword *int*,...
- 26.7k
2
votes
check50 failed on pset3 game of fifteen
check50 removes your draw function as that is not tested (you can personalize it however you'd like).
Because of this, if you update any global variables in that function, they won't be updated when ...
- 18.3k
2
votes
Accepted
Won()- Pset 3- Game of Fifteen
What happens at i == j == (d-1)? That's the last tile and it should equal 0, but your test will fail because of that.
If that answers your question, please click on the check mark to accept. Let's ...
- 63.1k
1
vote
How to set up the board using init and draw functions
In your init function you need to assign values to each position in the board array. In the draw function, you use the values from your board array to print to the screen. Note that the integer array ...
- 33
1
vote
Accepted
Fatal error: <cs50.h> file not included
Hmmm, two consecutive questions with roughly the same issue.
After running check50 on almost every problem from pset1 to pset5, it only happened on a handful of programs. Also, it has stopped ...
- 63.1k
1
vote
Check50 initialising error pset3
check50 has a lot of dependencies in order to work. One of them is that the blank tile is stored as 0 in the board[][] array. Your code appears to change that to -1, which takes up an extra ...
- 63.1k
1
vote
Accepted
Pset3, Error in init function
It looks like the original code that you had was more correct than after the changes you made, whatever they were. The original problem lies here:
board[d - 1][d - 1] = '_';
Since board[][] is an ...
- 63.1k
1
vote
Pset3, Error in init function
The last element in your board does not need to be initialized by you.
Remember you should organize your elements differently depending on the board size.
The way you initialize your elements doesn't ...
- 167
1
vote
Accepted
pset3: fifteen - problem with "move" function
The problem is with your if statements. In certain cases, you are trying to access array values that don't exist. Let's say the value at board[0][0] is 5. Will your first if statement be true?
if (...
- 44
1
vote
Accepted
pset3: fifteen - "init" and "draw"
8 7 6 5 3 1 0 -3 -6
It is what makes init () when d3, just have to take pen and paper and do some calculations.
for(int i = 0; i < d; i++)
{
int k = i + 1;
it leads to a wrong ...
- 5,172
1
vote
Accepted
fifteen.c fails to initialize correctly
It looks like the code that creates and populates the log.txt file was removed from the source code. That code is absolutely critical for check50 to test your program. What have you removed from the ...
- 63.1k
1
vote
Accepted
PSet 3 - Game of fifteen - draw tile gives weird output
The board[][] array is a global variable. In both functions, the code is creating a shadow array called board[][].
int board[DIM_MAX][DIM_MAX];
By redeclaring the board array in each function, it ...
- 63.1k
1
vote
move in pset3 fifteen not working properly
This code will only change a tile adjacent to the target tile to 0. It won't actually swap the tiles.
Once the code above finds the target tile in the board[][] array, it will choose one of the 4 ...
- 63.1k
1
vote
init and draw not working properly in pset3 fifteen
your init function is incorrect as noted @Matt Obert.
if (d%2 != 0)
{
for ....
}
if d = 4, for example, your function init will not doing nothing at all, since board [d-1] [d-2]; It not even ...
- 5,172
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