Question

我试图制作矩阵代数程序，所以我开始使用预先定义的3x3矩阵。对于未正确读入2D阵列的元素存在一些问题，因此我将其中一个分离出来。问题是连续的最后一个数字是作为下一行的第一个元素打印的。即阵列[1] [2]打印出阵列[2] [0]。

同样，如果我有一个3x3矩阵，我们从1到9，我想要第1行第3列（即3）的值，它会给我4.第2行也是如此3;值为6，但它给了我7.

我已经在打印声明中显示输入前的计数器值并且它们是正确的。我猜想有什么东西在扫描，但我真的很难过。任何帮助将不胜感激！

#include <stdio.h>

int matrix1[2][2];

void main(void)
{
    int i = 0, j=0;    //Row and column subscripts for the first matrix 

    //======================================================================================================//
    //First Matrix
    printf("This is for the first matrix");
    for(i=0; i < 3; i++) //Start with row
    {
        for(j = 0; j < 3; j++)
        {
            printf("\nInsert the value at row %d, column %d: ", i+1,j+1); //+1 since array's begin at 0
            printf("\ni is %d, j is %d", i,j); //Shows what elements the input will go into
            scanf("%d", &matrix1[i][j]); //Enter value into row i column j
        }

    }
    printf("\n\n%d", matrix1[1][2]); //test to see what's in the element
}

Answer 1

#include <stdio.h>

#define ROWS 3
#define COLS 3

int matrix1[ROWS][COLS];

void main(void)
   {
   int i, j;    //Row and column subscripts for the first matrix 

   //================================================================================
   //First Matrix
   printf("This is for the first matrix");
   for(i=0; i < ROWS; i++) //Start with row
      {
      for(j = 0; j < COLS; j++)
         {
         printf("\nInsert the value at row %d, column %d: ", i+1,j+1); 
         printf("\ni is %d, j is %d", i,j); 
         scanf("%d", &matrix1[i][j]);
         }
      }

   printf("\n\n%d", matrix1[1][2]); //test to see what's in the element
   }

Answer 2

我认为您对数组中数组索引号和元素总数感到困惑。

例如，当您有5个整数的数组时。

   int ary[5] = {11,22,33,44,55};

 `------------IN Memory-----------
  | 11 || 22 || 33 | | 44 | | 55 |      
   -------------------------------  `
    0     1     2       3      4  <--------These are called Index numbers.
                                           They always start with 0,Hence 
                               they always end with(Total Number of elements - 1)

因此从上面的解释中你要么想要改变数组的大小

从int matrix[2][2]到int matrix[3][3];

或

将for()循环更改为

for(i=0; i < 2; i++) //changed i<3 to i<2 { for(j = 0; j < 2; j++) //changed i<3 to i<2 { // your Code..... } }

发出从2D数组读取输入数据

2 个答案: