C++：错误，变量的多重定义

Question

收到错误消息说：SudokuGame\sudoku_solver.h:6：错误：`grid'的多重定义

谁能指出原因？我想我以错误的方式包含 sudoku_solver.h

请参阅下面我的部分代码文件。

sudoku_solver.cpp:

#include <iostream>
#include "sudoku_solver.h"

using namespace std;

bool isPresentInCol(int col, int num) {
        for (int row = 0; row < N; row++)
                if (grid[row][col] == num)
                        return true;
        return false;
}

sudoku_solver.h:

#ifndef SUDOKU_SOLVER_H
#define SUDOKU_SOLVER_H

#define N 9

int grid[N][N] = {
   {3, 0, 6, 5, 0, 8, 4, 0, 0},
   {5, 2, 0, 0, 0, 0, 0, 0, 0},
   {0, 8, 7, 0, 0, 0, 0, 3, 1},
   {0, 0, 3, 0, 1, 0, 0, 8, 0},
   {9, 0, 0, 8, 6, 3, 0, 0, 5},
   {0, 5, 0, 0, 9, 0, 6, 0, 0},
   {1, 3, 0, 0, 0, 0, 2, 5, 0},
   {0, 0, 0, 0, 0, 0, 0, 7, 4},
   {0, 0, 5, 2, 0, 6, 3, 0, 0}
};

/*
*Check if number is present in given coloum
*/
bool isPresentInCol(int col, int num);

/*
*Check if number is present in given row
*/
bool isPresentInRow(int row, int num);

#endif // SUDOKU_SOLVER_H

main.cpp:

#include "sudoku_solver.h"
#include <iostream>
using namespace std;

int main()
{
    if (solveSudoku())
        printSolvedSudoku();
    else
        cout << "No solution exists";

    return 0;
}

Answer 1

sudoku_solver.h 包含在 sudoku_solver.cpp 和 main.cpp 中。因此全局变量网格的两个定义。

C++：错误，变量的多重定义

C++: error, multiple definition of variable

c++

include

preprocessor