Question

所以我试图计算一个数组中每个数字的出现次数。

我到目前为止的代码如下所示：

#include <stdio.h>
#include <string.h>

int main()
{
  int numbers [10]= {1, 4, 5, 5, 5, 6, 6, 3, 2, 1};
  int count = 0;

  for(int i = 0; i < 10; i++)
  {
    for (int j = 0; j < 10; j++)
    {
      if (numbers[i] == numbers[j])
      {
        count++;
      }
    }
    printf("Number %d has occured %d many times \n", numbers[i], count);
    count = 0;

  }
}

只有我得到的输出如下：

Number: 1       Occurence: 2
Number: 4       Occurence: 1
Number: 5       Occurence: 3
Number: 5       Occurence: 3
Number: 5       Occurence: 3
Number: 6       Occurence: 2
Number: 6       Occurence: 2
Number: 3       Occurence: 1
Number: 2       Occurence: 1
Number: 1       Occurence: 2

我只想计算每个数字的出现次数，似乎是在计算重复数。

如何更正此代码？有人能指出我正确的方向。

非常感谢

阿隆索

Answer 1

考虑这个修改后的代码：

#include <stdio.h>
#include <string.h>

int main()
{
  int numbers [10]= {1, 4, 5, 5, 5, 6, 6, 3, 2, 1};
  int count = 0;

  for(int i = 0; i < 10; i++) { //i = current digit
    for (int j = 0; j < 10; j++) { //j = index in array
      if (i == numbers[j]) {
        count++;
      }
    }
    printf("Number %d has occured %d times \n", i, count);
    count = 0;
  }
}

输出：

Number 0 has occured 0 times 
Number 1 has occured 2 times 
Number 2 has occured 1 times 
Number 3 has occured 1 times 
Number 4 has occured 1 times 
Number 5 has occured 3 times 
Number 6 has occured 2 times 
Number 7 has occured 0 times 
Number 8 has occured 0 times 
Number 9 has occured 0 times

您正在计算阵列中每个数字出现的频率（包括数组中的重复数字）。

Answer 2

您将需要数组 - 一个用于计数（结果），另一个用于输入。循环输入数字时，应该在count数组中递增索引。我无法抗拒实际编写代码，所以，你去，以下应该工作 IN C ++

#include <stdio.h>
#include <string.h>

int main()
{
  int inputNumbers [] = {1, 4, 5, 5, 5, 6, 6, 3, 2, 1};
  int resultCount [] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  int countNumbers = sizeof(inputNumbers) / sizeof(inputNumbers[0]);

  for(int i = 0; i < countNumbers; i++)
  {
     resultCount[inputNumbers[i]]++;
  }

  for(int i = 0; i < countNumbers; i++)
  {
    printf("Number %d has occured %d times \n", i, resultCount[i]);
  }
}

希望有所帮助。

计算字符串中数字的出现次数

2 个答案: