我的二维数组中的数字频率没有正确输出

Question

例如，我的目标是使数组的大小为2x6，并输入第1行的值(0、1、2、3、4、5)和第2行的值(0、1、6、7、8、9)，然后输出:数字0发生2次，数字1发生2次，数字2次，数字2发生1次等等。下面是我的代码：

#include <stdio.h>

int main(void)
{
 int row, col, N, M, count, row1, col1;

 printf("This program counts occurrences of digits 0 through 9 in an NxM array.\n");
 printf("Enter the size of the array (Row Column): ");
 scanf("%d %d", &N, &M);

 int digits[N][M], freq[N][M];

 for (row = 0; row < N; row++){ 
  printf("Enter row %d: ", row);
  for (col = 0; col < M; col++){
   scanf("%d", &digits[row][col]);
  }
 } 

 freq[row][col] = -1;

 for (row = 0; row < N; row++){
  count = 1;
  for (row1 = row + 1; row1 < N; row1++){
   for (col = 0; col < M; col++){
    for (col1 = col + 1; col1 < M; col1++){
     if (digits[row][col] == digits[row1][col1]){
      count++;
      freq[row1][col1] = 0;
     }
    }
    if (freq[row][col] != 0){
     freq[row][col] = count;
    }
   } 
  } 
 }

 printf("Total counts for each digit:\n");
 for (row = 0; row < N; row++){
  for (col = 0; col < M; col++){
   if (freq[row][col] != 0){
    printf("Digit %d occurs %d times\n", digits[row][col], freq[row][col]);
   }
  } 
 } 

 return 0;
}

Answer 1

我认为第二个循环没有计算您所期望的，为什么不尝试这样的方法：

#include <stdio.h>

int main(void)
{
 int row, col, digit, N, M, currentValue;

 printf("This program counts occurrences of digits 0 through 9 in an NxM array.\n");
 printf("Enter the size of the array (Row Column): ");
 scanf("%d %d", &N, &M);

 int digits[N][M], freq[10] = { 0 };

 for (row = 0; row < N; row++){ 
  printf("Enter row %d: ", row);
  for (col = 0; col < M; col++){
   scanf("%d", &currentValue);
   digits[row][col] = currentValue;
   if (currentValue >= 0 && currentValue <=9) {
     freq[currentValue]++;
   }
  }
 } 

 printf("Total counts for each digit:\n");
 for (digit = 0; digit < 10; digit++){
   if (freq[digit] != 0){
    printf("Digit %d occurs %d times\n", digit, freq[digit]);
   }
 } 

 return 0;
}