Question

这里是代码，我试着查找解决方案，但我尝试过的东西并没有起作用。另外，检查文件是否打开的main底部的if语句失败并说它无法打开文件，但我不知道如何处理该错误。

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
const int row = 6;
const int col = 8;
void cellTemp (double check[][col], double);
int main()
{
    ifstream in;
    string input;
    ofstream out;
    string output;
    double grid[row][col];
    double t1, t2, t3, t4, tol;

    cout << "Enter input file name: \n";
    cin >> input;
    cout << "Enter output file name: \n";
    cin >> output;

    in.open(input.c_str());
    out.open(output.c_str());

    in >> t1 >> t2 >> t3 >> t4 >> tol;


    for(int i = 0; i < 6; i++)
    {
        for(int c = 0; c < 8; c++)
        {
            grid[i][c] = 0;
        }
    }

    //  Initializes top and bottom rows to 0
    for(int i = 0; i < 8; i++)
    {
        grid[0][i] = t1;
        grid[7][i] = t3;
    }
    //  Initializes left and right columns to 0
    for(int i = 1; i < 5; i++)
    {
        grid[i][0] = t4;
        grid[i][7] = t2;
    }

    cellTemp(grid, tol);
    if(out.is_open())
    {
        for(int i = 0; i < 6; i++)
        {
            for(int c = 0; c < 8; c++)
            {
                out << grid[i][c];
            }
            out << endl;
        }
        out.flush();
    }
    else
    {
        cout << "Cannot open file. \n";
    }
    out.close();
    in.close();
}
void cellTemp (double check[][col], double tolerance){

    double copy[row][col];
    double max = 0;
    double prev = 0;
    double prevMax;
    double prevTol = tolerance;

    tolerance = -1;
    while(prevMax > tolerance)
    {
        tolerance = prevTol;
        //  Copies the array before performing actions
        for(int i = 0; i < 6; i++)
        {
            for(int c = 0; c < 8; c++)
            {
                copy[i][c] = check[i][c];
            }
        }

        //  Sets cell values
        for(int i = 1; i < 5; i++)
        {
            for(int c = 1; c < 7; c++)
            {
                check[i][c] = (check[i-1][c] + check[i+1][c] +
                        check[i][c-1] + check[i][c+1]) / 4;
            }
        }

        for(int i = 1; i < 5; i++)
        {
            for(int c = 1; c < 7; c++)
            {
                prev = check[i][c] - copy[i][c];
                if(prev > max)
                {
                    max = prev;
                }
            }
        }
        prevMax = max;
        max = 0;
    }
}

Answer 1

grid[7][i] = t3;

你没有[7]行伙伴认为你想要网格[5] [i] = t3; ？

ofstream创建一个文件但不写

1 个答案: