合并排序后无法打印出双数数组

Question

请帮忙，不断出现这些错误。

main.cpp: In function ‘int main()’:


main.cpp:177:25: error: cannot convert ‘int*’ to ‘double*’ for argument ‘1’ to ‘void printArray(double*, double)’
 printArray(arr, arr_size);


main.cpp:179:31: error: cannot convert ‘int*’ to ‘double*’ for argument ‘1’ to ‘void mergeSort(double*, int, int)’
 mergeSort(arr, 0, arr_size - 1);
                               ^


main.cpp:183:25: error: cannot convert ‘int*’ to ‘double*’ for argument ‘1’ to ‘void printArray(double*, double)’
 printArray(arr, arr_size);

代码:

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

void merge(double arr[], int l, int m, int r)
{
    int i, j, k;
    int n1 = m - l + 1;
    int n2 = r - m;
    int L[n1], R[n2];
    for (i = 0; i < n1; i++)
        L[i] = arr[l + i];
    for (j = 0; j < n2; j++)
        R[j] = arr[m + 1 + j];
    i = 0;
    j = 0;
    k = l;

    while (i < n1 && j < n2)
    {
        if (L[i] <= R[j])
        {
            arr[k] = L[i];
            i++;
        }
        else
        {
            arr[k] = R[j];
            j++;
        }
        k++;
    }

    while (i < n1)
    {
        arr[k] = L[i];
        i++;
        k++;
    }

    while (j < n2)
    {
        arr[k] = R[j];
        j++;
        k++;
    }
}

void mergeSort(double arr[], int l, int r)
{
    if (l < r)
    {
        int m = l + (r - l) / 2;
        mergeSort(arr, l, m);
        mergeSort(arr, m + 1, r);
        merge(arr, l, m, r);
    }
}

void printArray(double A[], int size)
{
    int i;
    for (i = 0; i < size; i++)
        printf("%lf ", A[i]);
    printf("\n");
}

int main()
{
    int arr[1000] = { 0 };
    int arr_size = 0;
    int data;
    char file1[20];
    strcpy(file1, "random.data");
    FILE* fp;
    fp = fopen(file1, "r+");

    if (fp == NULL) // if file not opened return error
    {
        perror("Unable to open file");
        return -1;
    }
    else
    {
        fscanf(fp, "%d", &data);
        arr[arr_size] = data;
        arr_size++;
        while (!feof(fp))
        {
            fscanf(fp, "%d", &data);
            arr[arr_size] = data;
            arr_size++;
        }
    }

    printf("Given array is \n");
    printArray(arr, arr_size);
    mergeSort(arr, 0, arr_size - 1);
    printf("\nSorted array Using MERGE SORT is \n");
    printArray(arr, arr_size);

    return 0;
}

Answer 1

您的数组的类型为int。您的函数需要一个指向 double 的指针。对数组和函数使用 int 或 double。不要混合它。线路

fscanf(fp, "%d", &data);

读取整数，因此您可能应该在代码中的任何地方使用数据类型int。