C ++中的2d數組

Question

好的，我有這個程序，我在處理它時遇到了麻煩。 在addRows和subtractRows函數中，程序凍結，並且總和也不正確。 可以看看這個並指出我的錯誤嗎？ 謝謝。

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

const int ROW1MAX = 100;
const int COL1MAX = 100;
const int ROW2MAX = 100;
const int COL2MAX = 100;

void inputInfo(double[][COL1MAX], int , int );
void addRows(double AR[][COL2MAX], int ROW1, int RW2);
void subtractRows(double array[][COL2MAX], int RW1, int RW2);
void addColumns(double ar[][COL2MAX], int COL1, int COL2);
void subtractColumns(double RAY[][COL2MAX], int CL1, int CL2);
void printAry(int ary[ROW1MAX][COL1MAX]);
//void copyAry(double RR[][COL2MAX], int RZ, int CZ);
void rowLargestNumber(double RY[100][100], int RS, int COS);
void columnLargestNumber(double XC[100][100], int X, int Y);
void rowSmallestNumber(double BK[100][100], int RB, int CB);
void columnSmallestNumber(double QU[100][100], int ROWB, int COLB);
void replace(double VW[100][100], int D, int H);
void printAry(double GH[100][100], int A, int B);

int rows;
int colm;
double ary1[ROW1MAX][COL1MAX];
double ary2[ROW2MAX][COL2MAX];
ofstream jfOutputFile;

int main()
{
jfOutputFile.open("2D_Array_Stuff");
inputInfo(ary1, ROW1MAX, COL1MAX);
addRows(ary1, ROW1MAX, ROW1MAX);
subtractRows(ary1, ROW1MAX, ROW1MAX);
addColumns(ary1, COL1MAX, COL1MAX);
subtractColumns(ary1, COL1MAX, COL1MAX);
//copyAry(ary1, ROW1MAX, COL1MAX);
rowLargestNumber(ary2, ROW2MAX, COL2MAX);
columnLargestNumber(ary2, ROW2MAX, COL2MAX);
rowSmallestNumber(ary2, ROW2MAX, COL2MAX);
columnSmallestNumber(ary2, ROW2MAX, COL2MAX);
replace(ary2, ROW2MAX, COL2MAX);
printAry(ary2, ROW2MAX, COL2MAX);
jfOutputFile.close();
return 0;
}

void inputInfo(double inputInfo[][COL2MAX], int ROW1MAX, int COL1MAX)
{
cout << "How many rows are in your first array?: ";
cin >> ROW1MAX;
cout << "How many columns are in your first array?: ";
cin >> COL1MAX;
cout << "\nEnter the information for each row and column:\n";
for (rows = 0; rows < ROW1MAX; rows++)
{
    for (colm = 0; colm < COL1MAX; colm++)
    {
        cout << "Row " << (rows + 1);
        cout << ", Column " << (colm + 1)<< " : ";
        cin >> inputInfo[rows][colm];
    }
 }

   cout << "\nThe first array is: \n";
   cout<<endl;

   printAry(inputInfo, ROW1MAX, COL1MAX);

addRows(inputInfo, ROW1MAX, ROW1MAX); 
subtractRows(inputInfo, ROW1MAX, ROW1MAX); 
addColumns(inputInfo, COL1MAX, COL1MAX);
subtractColumns(inputInfo, COL1MAX, COL1MAX);

}

void addRows(double addRows[][COL2MAX], int row1, int row2)
{
double rowSum1 = 0;
double rowSum2 = 0;

for(colm = 0; colm < COL1MAX; colm++)
{
    rowSum1 = rowSum1 + addRows[row1][colm];
    cout<<rowSum1<<endl;
}
for(colm = 0; colm < COL1MAX; colm++)
{
   rowSum2 = rowSum2 + addRows[row2+4][colm];
}
cout << "\nthe sum of two rows is: " << rowSum1 + rowSum2 << ".\n";


    for (int r = 0; r < ROW1MAX; r++)
    {
        rowSum1 = 0;
        for (int c = 0; c < colm; c++)
        rowSum1 += addRows[r][c];
    }   
}



void subtractRows(double subRows[][COL2MAX], int rows1, int rows2)
{
int rowDif1 = 0;
int rowDif2 = 0;

for(colm = 0; colm < COL1MAX; colm++)
{
    rowDif1 = rowDif1 - subRows[rows1][colm];
}
for(colm = 0; colm < COL1MAX; colm++)
{
    rowDif2 = rowDif2 - subRows[rows2][colm];
}

   int subRowSum = rowDif2 - rowDif1;
cout << "\nThe difference between two rows is: " << subRowSum << ".\n";
}

void addColumns(double addCols[][COL2MAX], int colm1, int colm2)
{
double colSum1;
double colSum2;
          colSum1 = 0;colSum2=0;

for(rows = 0; rows < ROW1MAX; rows++)
{
    colSum1 = colSum1 + addCols[rows][colm1];
}
for(rows = 0; rows < ROW1MAX; colm++)
{
    colSum2 = colSum2 + addCols[rows][colm2];
}
cout << "\nThe sum of 2 columns is: " << colSum1 + colSum2 << ".\n";
}

void subtractColumns(double subCols[][COL2MAX], int colm1, int colm2)
{
double colDif1;
double colDif2;
   colDif1 = 0;
   colDif2 = 0;
for(rows = 0; rows < ROW1MAX; rows++)
{
    colDif1 = colDif1 - subCols[rows][colm1];
}
for(rows = 0; rows < ROW1MAX; rows++)
{
    colDif2 = colDif2 - subCols[rows][colm2];
}
cout << "\nThe difference between 2 columns is: " << colDif2 - colDif1 << ".\n";
}

void copyAry(double copyAry[100][100], int RA, int CB)
{
for (rows = 0; rows < RA; rows++)
{
    for (colm = 0; colm < CB; colm++)
    {
          copyAry[RA][CB] = ary2[ROW2MAX][COL2MAX];
    }
}
cout << "\nThe copied array is:\n" << ary2[ROW2MAX][COL2MAX] << ".\n";

}

void rowLargestNumber(double rowLgstNum[100][100], int RS, int COS)
{
double highest;

for (int rw = 0; rw < RS; rw++)
{
    highest = rowLgstNum[rw][0];

    for (int clm = 0; clm < COS; clm++)
    {
          if ( rowLgstNum[rw][clm] > highest)
          {
                highest = rowLgstNum[rw][clm];
          }
    }
}
cout << "The highest number in Row " << ROW2MAX << "is " << highest << ".\n";
}

void columnLargestNumber(double colLgstNum[100][100], int X, int Y)
{
double HIGH;

for (int CM = 1; CM < Y; CM++)
{
    HIGH = colLgstNum[0][CM];

    for (int RW = 0; RW < X; RW++)
    {
          if ( colLgstNum[RW][CM] > HIGH)
          {
                HIGH = colLgstNum[RW][CM];
            }
    }
}

cout << "The highest number in Column " << COL2MAX << "is " << HIGH << ".\n";
}

void rowSmallestNumber(double rowSmstNum[100][100], int RB, int CB)
{
double lowest;

for (int rx = 1; rx < RB; rx++)
{
    lowest = rowSmstNum[rx][0];

    for (int cx = 0; cx < CB; cx++)
    {
          if ( rowSmstNum[rx][cx] < lowest)
          {
                lowest = rowSmstNum[rx][cx];
            }
    }
}

cout << "The lowest number in Row " << ROW2MAX << "is " << lowest << ".\n";
}

void columnSmallestNumber(double colSmstNum[100][100], int ROWB, int COLB)
{
double LOW;

for (int CN = 0; CN < COLB; CN++)
{
    LOW = colSmstNum[0][CN];

    for (int rH = 0; rH < ROWB; rH++)
    {
          if ( colSmstNum[rH][0] < LOW)
          {
                LOW = colSmstNum[rH][CN];
            }
    }

cout << "The lowest number in Column " << COL2MAX << "is " << LOW << ".\n";
}
}

void replace(double replace[100][100], int D, int H)
{
for (int f = 0; f < D; f++)
{
    for (int c = 0; c < H; c++)
    {
        replace[1][1] = 100;
    }
}
}

void printAry(double prtAry[ROW1MAX][COL1MAX], int A, int B)
{
for (int a = 0; a < A; a++)
{
    for (int b = 0; b < B; b++)
    {
                 cout << prtAry[a][b] << " ";

                 if(b==B)
                 {
           cout<<endl;
        }
    }
}
 cout << "\n";
}

Answer 1

這里有一些問題。 首先，切勿為變量使用與您的方法/函數相同的名稱。 當我們將“ addRows”同時視為變量和函數時，這很令人困惑。

專門針對您的問題，為什么addRows失敗，您將數組聲明為ROW1MAX，但嘗試訪問行ROW1MAX。 在聲明（創建數組的位置）中，指定多少行 。 當您實際訪問數組時，它是一個基於0的索引。 因此，具有5行的數組將具有行0、1、2、3和4。沒有5。