文件操作复习

 1 //fgetc(fp)
 2     /*FILE *fp = NULL;
 3     char ch;
 4     char filename[MAX] = { 0 };
 5     printf("please input file name\n");
 6     scanf("%s", filename);
 7     fp = fopen(filename, "r");
 8     if (fp == NULL)
 9     {
10     printf("open file error \n");
11     return 0;
12     }
13     while (!feof(fp))
14     {
15     ch = fgetc(fp);
16     printf("%c", ch);
17     }
18     fclose(fp);
19     system("pause");
20     return 0;*/

 1 //fputc(ch,fp)
 2     /*FILE *fp = NULL;
 3     char ch;
 4     fp = fopen("stu.txt", "a");
 5     if (fp == NULL)
 6     {
 7     printf("open file error\n");
 8     return 0;
 9     }
10     while (1)
11     {
12     ch = getchar();
13     if (ch != ‘#‘)
14     {
15     fputc(ch, fp);
16     }
17     else
18     {
19     break;
20     }
21 
22     }
23     fclose(fp);
24     system("pause");
25     return 0;*/

 1 //fgets,fputs
 2     /*char srcfile[MAX] = { 0 };
 3     char desfile[MAX] = { 0 };
 4     char buff[MAX] = { 0 };
 5     FILE *srcfp = NULL;
 6     FILE *desfp = NULL;
 7     printf("please input src filename:");
 8     scanf("%s", srcfile);
 9     printf("please input des filename:");
10     scanf("%s", desfile);
11     srcfp = fopen(srcfile, "r");
12     desfp = fopen(desfile, "w");
13     if ((srcfp == NULL) || (desfp == NULL))
14     {
15     printf("open file error \n");
16     return 0;
17     }
18     while (!feof(srcfp))
19     {
20     fgets(buff, 12, srcfp);
21     fputs(buff, desfp);
22     }
23     printf("copy succeed");
24     fclose(desfp);
25     fclose(srcfp);
26     system("pause");
27     return 0;*/

 1 //fprintf()
 2     /*int n = 0;
 3     int i = 0;
 4     FILE * fp = NULL;
 5     fp = fopen("stu1.txt", "w");
 6     if (fp == NULL)
 7     {
 8     printf("open file error\n");
 9     return 0;
10     }
11     printf("please input number:");
12     scanf("%d", &n);
13     for (i = 1; i < n; i++)
14     {
15     if (isPrime(i))
16     {
17     fprintf(fp, "%d is prime\n", i);
18     }
19     }
20     printf("over!\n");
21     fclose(fp);
22     system("pause");
23     return 0;*/

 1 //fscanf()
 2     /*FILE * fp = NULL;
 3     int n = 0;
 4     char buff[5] = { 0 };
 5     fp = fopen("stu1.txt", "r");
 6     if (fp == NULL)
 7     {
 8     printf("open file error\n");
 9     return 0;
10     }
11     while (!feof(fp))
12     {
13     fscanf(fp, "%d %s prime\n", &n,buff);
14     printf("%d %s\n", n,buff);
15     }
16     printf("\n");
17     fclose(fp);
18     system("pause");
19     return 0;*/

 1 //fseek()
 2     /*FILE *fp = NULL;
 3     char buff[32] = { 0 };
 4     fp = fopen("stu1.txt", "r");
 5     if (fp == NULL)
 6     {
 7     printf("open file error\n");
 8     return 0;
 9     }
10     fseek(fp, 10, SEEK_SET);
11     //fseek(fp, -10, SEEK_END);
12     for (int i = 0; i < 10; i++)
13     {
14     buff[i]= fgetc(fp);
15     }
16     printf("buf:%s", buff);
17     system("pause");
18     return 0;*/
19     //ftell()
20     /*FILE *fp = NULL;
21      char filename[32] = { 0 };
22      long size = 0;
23      printf("please input filename:");
24      scanf("%s", filename);
25      fp = fopen(filename, "r");
26      if (fp == NULL)
27      {
28      printf("open file error\n");
29      return 0;
30      }
31      fseek(fp, 0, SEEK_END);
32      size = ftell(fp);
33      fclose(fp);
34      printf("%s file size :%d", filename, size);
35      system("pause");
36      return 0;*/
37     //rewind()
38     /*char srcfile[MAX] = { 0 };
39     char desfile[MAX] = { 0 };
40     FILE *srcfp = NULL;
41     FILE *desfp = NULL;
42     printf("please input src filename:");
43     scanf("%s", srcfile);
44     printf("please input des filename:");
45     scanf("%s", desfile);
46     srcfp = fopen(srcfile, "r");
47     desfp = fopen(desfile, "w");
48     if ((srcfp == NULL) || (desfp == NULL))
49     {
50     printf("open file error \n");
51     system("puase");
52     return 0;
53     }
54     while (!feof(srcfp))
55     {
56     putchar(fgetc(srcfp));
57     }
58     printf("\n");
59     rewind(srcfp);
60     while (!feof(srcfp))
61     {
62     fputc(fgetc(srcfp),desfp);
63     }
64     printf("copy succeed");
65     fclose(desfp);
66     fclose(srcfp);
67     system("pause");
68     return 0;*/

 1 //二进制文件的读写fread() fwrite()
 2     /*STUDENT studentArray[SIZE] = { { 0 } };
 3     int i = 0;
 4     for (i = 0; i < SIZE; i++)
 5     {
 6     printf("please input student info:\n");
 7     scanf("%d %s %d %d %s", &(studentArray[i].id), studentArray[i].name, &(studentArray[i].age),
 8     &(studentArray[i].score), studentArray[i].addr);
 9     save(&studentArray[i]);
10     }
11     system("pause");
12     return 0;*/
13     /* STUDENT studentArray[SIZE] = { { 0 } };
14      int i = 0;
15      load(studentArray);
16      for (i = 0; i < SIZE; i++)
17      {
18      printf("%d %s %d %d %s\n", studentArray[i].id, studentArray[i].name, studentArray[i].age,
19      studentArray[i].score, studentArray[i].addr);
20      }
21      system("pause");
22      return 0;*/
23 
24     /*char filename[20] = { 0 };
25      printf("please input delete file:");
26      scanf("%s", filename);
27      if (0 == remove(filename))
28      {
29      printf("ok");
30      }
31      else
32      printf("failed");
33      system("pause");
34      return 0;
35      */