关于#c语言#的问题：在main函数中创建一个文件，将键盘输入的字符串（该字符串只包含数字、字母和）写入文件中

在main函数中创建一个文件，将键盘输入的字符串（该字符串只包含数字、字母和）写入文件中。打开该文件，读出字符串。将字符串中的数字放到最前面，字母放到中间，号放到最后，并将形成的新串存放到另一个文件中。比如，aC12d3，经变换为，123aCd**。

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

// swap two characters
void swap(char *a, char *b)
{
    char t = *a;
    *a = *b;
    *b = t;
}

// return the category of the character
int category(char a)
{
    if (isdigit(a))
        return 0;
    else if (isalpha(a))
        return 1;
    else
        return 2;
}

// compare two characters according to categories
int compare(char a, char b)
{
    return category(a) - category(b);
}

// bubble sort
void sort(char str[], int n)
{
    for (int i = 0; i < n - 1; i++)
    {
        for (int j = 0; j < n - 1 - i; j++)
        {
            if (compare(str[j], str[j + 1]) > 0)
                swap(&str[j], &str[j + 1]);
        }
    }
}

int main()
{
    char buffer[255];
    FILE *file = fopen("file1.txt", "w");
    if (!file)
    {
        perror("failed to open file1.txt");
        return 1;
    }
    scanf("%s", buffer);
    fprintf(file, "%s", buffer);
    fclose(file);

    file = fopen("file1.txt", "r");
    if (!file)
    {
        perror("failed to open file1.txt");
        return 2;
    }
    fscanf(file, "%s", buffer);
    fclose(file);

    sort(buffer, strlen(buffer));

    file = fopen("file2.txt", "w");
    if (!file)
    {
        perror("failed to open file2.txt");
        return 3;
    }
    fprintf(file, "%s", buffer);
    fclose(file);

    return 0;
}

解答如下
把代码文件和text.txt文件放在同一目录下即可

#include <stdio.h>
#include <string.h>
void swap() 
{
    char t[150]; 
    FILE* fp;
    fp=fopen("text.txt","r");
    if(fp==NULL)
    {
        printf("文件打开失败！\n");
        return;
    }
    else
    {
        fscanf(fp,"%s",t);
        printf("%s\n",t);
    }
    fclose(fp);
    int n=strlen(t);
    int num=0;
    for(int i=0;i<n;i++)
    {
        if(t[i]<='9'&&t[i]>='0')
        {
            char tem=t[i];
            for(int j=i;j>num;j--)
            {
                t[j]=t[j-1];
            }
            t[num]=tem;
            num++;
        }
    }
    printf("%s\n",t);
    FILE* fp2;
    fp2=fopen("text-2.txt","w");
    if(fp2==NULL)
    {
        printf("文件打开失败！\n");
        return;
    }
    else
    {
        fprintf(fp,"%s\n");
    }
    fclose(fp2);
}
int main()
{
    FILE* fp;
    swap();
    return 0;
}

你看一下你贴的文字，有些*号都看不到了，把内容放到代码块吧

#include <stdio.h>
#include <stdlib.h>
#inclue <string.h>
int main()
{
    FILE *fp1 = fopen("D:\\file1.dat","w");
    FILE *fp2 = NULL;
    FILE *fp3 = NULL;
    int i=0;
    int m1=0,m2=0,m3=0;
    char s[1000] = {0};
    char s1[1000] = {0};
    char s2[1000] = {0};
    char a1[1000] = {0},a2[1000] = {0},a3[1000] = {0};
    if(fp1 == NULL)
    {
        printf("file1 open error !");
        return 1;
    }
    scanf("%s",s);
    fwrite(s,1,strlen(s),fp1);
    fclose(fp1);
    //
    fp2 = fopen("D:\\file1.dat","r");
    fread(s1,1,1000,fp2);
    fclose(fp2);
    while(s1[i] != '\0')
    {
        if(s1[i] == '*')
            a3[m3++] = s1[i];
        else if(s1[i] >='0' && s1[i] <='9')
            a1[m1++] = s1[i];
        else
            a2[m2++] = s1[i];
        i++;
    }
    strcpy(s2,a1);
    strcpy(s2+strlen(a1),a2);
    strcpy(s2+strlen(a1)+strlen(a2),a3);
    //
    fp3 = fopen("D:\\file2.dat","w");
    if(fp3 == NULL)
    {
        printf("file2 open error !");
        return 1;
    }
    fwrite(s2,1,strlen(s2),fp3);
    fclose(fp3);
    return 0;
}