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  1. // C program to append the contents of
  2. // source file to the destination file
  3. // including header files
  4. #include <stdio.h>
  5.  
  6. // Function that appends the contents
  7. void appendFiles(char source[],
  8. 				char destination[])
  9. {
  10. 	// declaring file pointers
  11. 	FILE *fp1, *fp2;
  12.  
  13. 	// opening files
  14. 	fp1 = fopen(source, "a+");
  15. 	fp2 = fopen(destination, "a+");
  16.  
  17. 	// If file is not found then return.
  18. 	if (!fp1 && !fp2) {
  19. 		printf("Unable to open/"
  20. 			"detect file(s)\n");
  21. 		return;
  22. 	}
  23.  
  24. 	char buf[100];
  25.  
  26. 	// explicitly writing "\n"
  27. 	// to the destination file
  28. 	// so to enhance readability.
  29. 	fprintf(fp2, "\n");
  30.  
  31. 	// writing the contents of
  32. 	// source file to destination file.
  33. 	while (!feof(fp1)) {
  34. 		fgets(buf, sizeof(buf), fp1);
  35. 		fprintf(fp2, "%s", buf);
  36. 	}
  37.  
  38. 	rewind(fp2);
  39.  
  40. 	// printing contents of
  41. 	// destination file to stdout.
  42. 	while (!feof(fp2)) {
  43. 		fgets(buf, sizeof(buf), fp2);
  44. 		printf("%s", buf);
  45. 	}
  46. }
  47.  
  48. // Driver Code
  49. int main()
  50. {
  51. 	char source[] = "file1.txt",
  52. 		destination[] = "file2.txt";
  53.  
  54. 	// calling Function with file names.
  55. 	appendFiles(source, destination);
  56.  
  57. 	return 0;
  58. }
  59.  
Success #stdin #stdout 0s 5296KB
comments (?)
stdin
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Standard input is empty
stdout
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Unable to open/detect file(s)
https://ideone.com/prRtfd
language:
C (gcc 8.3)
created:
13 days ago
visibility:
public

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