程序代码：

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

#define MAX 50

int main(void)
{
    char buffer_1[MAX];                              /* 读取文件1          */
    char buffer_2[MAX];                             /* 读取文件2          */
    int count1 = 0;                                /* 记录buffer字符个数 */
    int count2 = 0;
    int row1 = 0;                                 /* 行数             */
    int row2 = 0;
    char mode[100];

    FILE *pfile1 = NULL;                         /* 调用文件的指针   */
    FILE *pfile2 = NULL;
    FILE *pfile3 = NULL;

    char *filename1 = "E:\\才、\\Test\\1.txt";  /* 文件路径        */
    char *filename2 = "E:\\才、\\Test\\2.txt";
    char *filename3 = "E:\\才、\\Test\\3.txt";

    if(!(pfile1 = fopen(filename1, "r")))
    {
        printf("读取文件%s失败\n",filename1);
        return 1;
    }

    if(!(pfile2 = fopen(filename2, "r")))
    {
        printf("读取文件%s失败\n",filename2);
        return 1;
    }

    if(!(pfile3 = fopen(filename3, "w")))
    {
        printf("读取文件%s失败\n");
        return 1;
    }

    sprintf(mode, "相同字符串：\n%%-%ds\n%%-%ds\n文件1行号: %%-4d文件2行号:%%-4d\n\n",
        MAX, MAX);

    for(;;)
    {
      row1++;                                            /* 递增行数 */
      while((buffer_1[count1++] = fgetc(pfile1)) != '\n');
      buffer_1[--count1] = '\0';

      if(feof(pfile1))
          break;

      for(;;)
      {
      row2++;
      count2 = 0;
      while((buffer_2[count2++] = fgetc(pfile2)) != '\n' && buffer_2[count2-1] != EOF );
     
      if(feof(pfile2))
          break;
     
      buffer_2[--count2] = '\0';
      if(strcmp(buffer_1, buffer_2) == 0)
      fprintf(pfile3, mode, buffer_1, buffer_2, row1, row2);
     
      }
      rewind(pfile2);
      count1 = 0;
      row2 = 0;
    }

    fclose(pfile1);
    fclose(pfile2);
    fclose(pfile3);

    return 0;
}

程序代码：

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

#define MAX 50

int main(void)
{
    char buffer_1[MAX];                              /* 读取文件1          */
    char buffer_2[MAX];                             /* 读取文件2          */
    int count1 = 0;                                /* 记录buffer字符个数 */
    int count2 = 0;
    int row1 = 0;                                 /* 行数             */
    int row2 = 0;
    char mode[300];

    FILE *pfile1 = NULL;                         /* 调用文件的指针   */
    FILE *pfile2 = NULL;
    FILE *pfile3 = NULL;

    char *filename1 = "E:\\才、\\Test\\1.txt";  /* 文件路径        */
    char *filename2 = "E:\\才、\\Test\\2.txt";
    char *filename3 = "E:\\才、\\Test\\3.txt";

    if(!(pfile1 = fopen(filename1, "r")))
    {
        printf("读取文件%s失败\n",filename1);
        return 1;
    }

    if(!(pfile2 = fopen(filename2, "r")))
    {
        printf("读取文件%s失败\n",filename2);
        return 1;
    }

    if(!(pfile3 = fopen(filename3, "w")))
    {
        printf("读取文件%s失败\n");
        return 1;
    }

    sprintf(mode, "相同字符串：\n%%-%ds\n%%-%ds\n文件1行号: %%-4d文件2行号:%%-4d\n\n",
        MAX, MAX);

    for(;;)
    {
      row1++;                                            /* 递增行数 */
      while((buffer_1[count1++] = fgetc(pfile1)) != '\n' && buffer_1[count1-1] != EOF);
    
      if(feof(pfile1))
      {
          printf("\nEnd\n");
          break;
      }

      buffer_1[--count1] = '\0';
      for(;;)
      {
      row2++;
      count2 = 0;
      while((buffer_2[count2++] = fgetc(pfile2)) != '\n' && buffer_2[count2-1] != EOF );
     
      if(feof(pfile2))
          break;
     
      buffer_2[--count2] = '\0';
      if(strcmp(buffer_1, buffer_2) == 0)
      fprintf(pfile3, mode, buffer_1, buffer_2, row1, row2);
     
      }
      rewind(pfile2);
      count1 = 0;
      row2 = 0;
    }

    fclose(pfile1);
    fclose(pfile2);
    fclose(pfile3);
   
    /* 删除功能
    if(remove(filename1) == EOF)
    printf("删除文件%s失败\n",filename1);
    else
    printf("删除成功！\n");

    remove(filename2);
    remove(filename3);
    */

    return 0;
}