计算字符串中某个数字出现的次数

Question

所以我正在尝试计算数组中每个数字的出现次数。

到目前为止，我的代码如下所示：

#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 

我只想统计每个数字出现的次数，好像是重复数。

如何更正此代码？有人能指出我正确的方向吗？

非常感谢

阿隆索

Answer 1

您将需要数组 - 一个用于计数（结果），一个用于输入。当您循环输入数字时，您应该增加计数数组中的索引。我无法抗拒实际编写代码，所以，给你，以下应该可以工作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]);
  }
}

希望对您有所帮助。

Answer 2

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 

您正在计算数组中出现的每个数字（包括数组中的重复数字）出现的频率。