I need explanation on this code

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hi i need help in my code I'm facing problem how can i make a condition to make to queen can only be in specific coordinate and all other coordinate is vailed i have 8 colum and 8 rows and here is my code
also when the user input the first colum and row the program will display the answer then exit its not going to ask other question for new row and colum it should ask the user for 8 rows and colum the vailed once are in the solution other should be invailed
the code is here

C++

#include <stdio.h>   
#include <conio.h>   
#include <windows.h>   
#define N 8  
 
void Color(int col) {  
    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);  
    SetConsoleTextAttribute(hConsole, col);  
}  
int brd[][8]=
                       { { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0} ,
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0} ,
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0} ,
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0} , 
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0} , 
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0} ,
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0},
 
                        { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0}
                         };
                         
void printSolution(int board[N][N]) {
    int queen[0];
 
printf("Enter the queen location in row : ");
scanf("%d",&queen[0]);  
queen[0] = queen[0] - 1;
printf("Enter the queen location in colum : ");
scanf("%d",&queen[1]);
queen[1] = queen[1] - 1;
 
    if (queen[0]>7)
    { 
    
        printf("invailed location\n");return;
    }
    if (queen[1] <0){
    
    
        printf("invailed location\n");return;
        
}
             else  {
                 
           printf("%d %d \n", queen[0], queen[1]);
           
           brd[queen[0]][queen[1]] = 1;
        }
 
    for (int i = 0; i < N; i++) {  
        for (int j = 0; j < N; j++) {  
            if (brd[i][j] == 1) {  
                Color(2);  
                printf("%d ", brd[i][j]);  
            } else {  
                Color(15);  
                printf("%d ", brd[i][j]);  
            }  
        }  
        printf("\n");  
           board[queen[0]][queen[1]] = 1;
        } 
        printf("the correct solution  :\n");
        
        
    for (int i = 0; i < N; i++) {  
        for (int j = 0; j < N; j++) {  
            if (board[i][j] == 1) {  
                Color(2);  
                printf("%d ", board[i][j]);  
            } else {  
                Color(15);  
                printf("%d ", board[i][j]);  
            }  
        }  
        printf("\n");  
    }  
    }  
 
 
bool isSafe(int board[N][N], int row, int col) {  
    int i, j;  
  
    for (i = 0; i < col; i++)  
        if (board[row][i]) return false;  
   
    for (i = row, j = col; i >= 0 && j >= 0; i--, j--)  
        if (board[i][j]) return false;  
 
    for (i = row, j = col; j >= 0 && i < N; i++, j--)  
        if (board[i][j]) return false;  
    return true;  
}  
  
bool solveNQUtil(int board[N][N], int col) {  
    
    if (col >= N) return true;  
    
    for (int i = 0; i < N; i++) {  
        
        if (isSafe(board, i, col)) {  
              
            board[i][col] = 1;  
              
            if (solveNQUtil(board, col + 1)) return true;  
            
            board[i][col] = 0; 
        }  
    }  
     
    return false;  
}  
 
bool solveNQ() {  
    int board[N][N] = {  
        {  
            0,  
            0,  
            0,  
            0  
        },  
        {  
            0,  
            0,  
            0,  
            0  
        },  
        {  
            0,  
            0,  
            0,  
            0  
        },  
        {  
            0,  
            0,  
            0,  
            0  
        }  
    };  
    if (solveNQUtil(board, 0) == false) {  
        printf("Solution does not exist");  
        return false;  
    }  
    printSolution(board);  
    return true;  
}  
int main() {  
    solveNQ();  
    _getch();  
    return 0;  
}

What I have tried:

tried different method nothing working with me please test the code and try to solve this for me

Posted 23-Dec-21 23:24pm

Silver 2021

Updated 24-Dec-21 0:58am

KarstenK

v2

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3 solutions

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k5054 · Answer 1 · 2021-12-24T00:17:00

C

int queen[0];

Really? Think about that. That's declaring an array with 0 elements. If you're using MSVC, you should be getting compiler error C2466: cannot allocate an array of constant size 0.
If you want to have the user enter multiple guesses, you probably want to have a loop to handle that, maybe something like

C

char answer;
do {
    printSolution(board);
    printf("try again?");
    answer = _getch();
} while( answer == 'y' || answer == 'Y');

KarstenK · Answer 2 · 2021-12-23T23:31:00

Solution 1

You must understand the code yourself by reading it and using the debugger. Visit some Debugger tutorial to learn the usage.

tip: make some more output in problematic code

Posted 23-Dec-21 23:31pm

KarstenK

OriginalGriff · Answer 3 · 2021-12-24T00:58:00

Even if I wanted to go near that code - which I don't, it's student grade at best - it wouldn't help you to tell you what the problem is.

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:

Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16

Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:

C

int Double(int value)
   {
   return value * value;
   }

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!

I need explanation on this code

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