Click here to Skip to main content
14,699,759 members
Please Sign up or sign in to vote.
1.00/5 (1 vote)
See more:
I have 2 functions replace and replace with backup as follows:
void replace_j(char* oldWord, char* newWord)
    FILE * fPtr;
    FILE * fTemp;
    FILE* f;
    char path[100];
    char file[BUFFER_SIZE];
    char buff[BUFFER_SIZE];
 //   char oldWord[100], newWord[100];
    f= fopen("files_to_be_scanned.txt", "r");
    while (!feof(f))
       // file[strlen(file) - 1] = '\0';
    	printf("\nfile is %s\n",file);
        printf("path is %s\n",path);
        path[strlen(path) - 1] = '\0';
        fPtr  = fopen(path, "r");
        if(fPtr == NULL)
        fTemp = fopen("replace.tmp", "w");

        /* fopen() return NULL if unable to open file in given mode. */
        if (fPtr == NULL || fTemp == NULL)
            /* Unable to open file hence exit */
            printf("\nUnable to open file.\n");
            printf("Please check whether file exists and you have read/write privilege.\n");

         * Read line from source file and write to destination
         * file after replacing given word.
        while ((fgets(buff, BUFFER_SIZE, fPtr)) != NULL)
            // Replace all occurrence of word from current line
            replaceAll(buff, oldWord, newWord);

            // After replacing write it to temp file.
            fputs(buff, fTemp);

        /* Close all files to release resource */

        /* Delete original source file */

        /* Rename temp file as original file */
        rename("replace.tmp", path);

        printf("\nSuccessfully replaced all occurrences of '%s' with '%s'.\n", oldWord, newWord);

void replace_with_backup(char* OldWord,char* NewWord)

    char filename[100];
    int j=0;
    FILE *fptr1, *fptr2;
    //int k=num_files;
        printf("Enter the filename to open for writing %s\n",buffer[j]);
        scanf("%s", filename);
        fptr1= fopen(buffer[j], "r");
        if (fptr1 == NULL)
            printf("Cannot open file %s \n", filename);
        // Open another file for writing
        fptr2 = fopen(filename, "w");
        if (fptr2 == NULL)
            printf("Cannot open file %s \n", filename);
        c = fgetc(fptr1);
        while (c != EOF)
            fputc(c, fptr2);
            c = fgetc(fptr1);
        printf("\nContents copied to %s\n", filename);

the replace function works fine with the argements:
a replace I He -- file1.txt file2.txt file3.txt
but when using it with backup function it replaces only the last file

What I have tried:

I have tried to trace and check every function individually and all works fine but with the combination of the two there is a problem
Updated 5-Feb-20 4:26am

1 solution

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:
Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16
Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:
int Double(int value)
   return value * value;

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

  Print Answers RSS
Top Experts
Last 24hrsThis month

CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900