为什么这段代码在 c 中失败？

用户3044096

我试图循环一个二维数组，但由于某种原因，语句：

var = matrix[i + 1][j] // Fails for i = 1 and j = 0

但

next = i + 1; var = matrix[next][j] // Works, why???..

我认为它应该有效，因为如果我等于 1 并且我加 1 它是 2，并且我知道该值不为空，至少在我的情况下，哦，要提到的一件事是我正在使用以下输入进行测试：> 4 4 1，表示一个 4x4 矩阵，旋转 1 次，所以我确信矩阵 [2][0] 不是空的，我可以打印它并访问它等等。

这是整个代码：

#include <stdio.h> 
#include <stdlib.h>


void rotateMatrix(int** matrix, int top, int right, int left, int bottom)
{
//int rows = right;
//int columns = bottom;
int rowScan = 0;

int columnScan = 0;

int high = 0;
int low = 0;
int test = matrix[2][0]; 


for (int i = 0; rowScan != 1;)
{
    for (int j = 0; columnScan != 1;)
    {
        //int next = i + 1;
        high = matrix[i + 1][j]; //FAILS HERE WHEN 
        matrix[i + 1][j] = low != 0 ? low : matrix[i][j];
        i++;

        if (i >= bottom)
        {
            bottom--;
            break;
        }

        if ((i + 1) < bottom)
        {
            low = matrix[i + 1][j];
            matrix[i + 1] = high;
        }

        if ((i + 1) == bottom)
        {
            columnScan = 1;
            rowScan = 1; 
        }

       }
      }
    }



  int main()
 {
//-- Declaring variables
int rows, columns, rotations;

//-- Initializing variables
rows = 0;
columns = 0;
rotations = 0;

//-- Scanning parameters and adding them to the stdin buffer
scanf("%d %d %d", &rows, &columns, &rotations);

//-- Initializing 2D array to save the Matrix values allocating space in memory
int **matrix = (int**)malloc(rows * sizeof(int*));

//-- Initializing each allocated pointer to each column size
for (int i = 0; i < rows;i++)
    matrix[i] = malloc(columns * sizeof(int));

//-- Scanning Matrix values and saving them into stdin buffer
for (int i = 0; i < rows; i++)
    for (int j = 0; j < columns; j++)
        matrix[i][j] = rand() % 10;
//      scanf("%d", &matrix[i][j]);

//-- Rotating R times
 while ((rotations--) != 0)
    rotateMatrix(matrix, 0, columns, 0, rows); 


for (int i = 0; i < rows; i++)
{
    for (int j = 0; j < columns; j++)
    {
        printf("%d", matrix[i][j]);
    }
    printf("\n");
}

getchar(); 
getchar();

return 0;
   }

用户3044096