C language: Read and write data with character read stream and output stream. (text file)

2. /*
4. Several modes of operation of the file: R: Read-only W: write-only RW: readable and writable
6. File classification: T: Text file (character file) B: Binary file (byte file)
8. Attention:
10. When opening a file with read-only mode, opening the file will fail if the source file does not exist!
12. When you open a file in write-only mode, it does not fail, regardless of whether the source file exists. (Because a file is automatically created)
14. When you open a file in a readable and writable manner, it succeeds.
16. */
18. #include <stdio.h>
20. int main ()
22. {
24. //define file pointers
26. FILE *fpin = NULL;
28. FILE *fpout = NULL;
30. //Open write file
32. Fpin = fopen ("1.txt", "wt");
34. if (fpin==null)
36. {
38. printf ("File open failed!\n");
40. return-1;
42. }
44. //File write
46. Char cs;
48. While ((cs = GetChar ()) = = ' Q ')
50. {
52. FPUTC (cs,fpin);
54. }
56. //file close
58. fclose (fpin);
60. //Open read file
62. fpout = fopen ("1.txt", "RT");
64. if (fpout==null)
66. {
68. printf ("File open failed!\n");
70. return-1;
72. }
74. //file read
76. While (!feof (fpout))
78. {
80. //character read file
82. char cc = FGETC (fpout);
84. //Compare with EOF to determine whether to read the end of the file
86. if (cc==eof)
88. {
90. Break ;
92. }
94. //output character
96. Putchar (cc);
98. }
100. //file close
102. fclose (fpout);
104. return 0;
106. }

C language: Read and write data with character read stream and output stream. (text file)