merge text files in C

Hi I am trying to create a program in which I want to store the words which I have from one text file to another text file but I do not want to delete the elements in which I have to the second file .

The problem is that when I ran my code and it overwrites elements from one file to another instead of "passing" elements from one file to another .

How can I fix this? Is it better to store to a third empty file?
Excuse for my english

text files :
con1 (github.com)
con2 (github.com)

Code:

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#include<stdio.h>
#include<stdlib.h>


int main ()
{
   
    FILE *fp1, *fp2;
    char arr[10][100]={"aaaa","bbbbbbdbdhcdc","bjjbkgfjnfjbfj","vfvmvldvddkv"};
    fp1=fopen("con1.txt","w");
    int i=0;
    for(i=0 ; i<4 ; i++)
    {
        fputs(arr[i],fp1);
        fputs(" ",fp1);
    }
   
    fclose(fp1);
   
   
    fp1=fopen("con1.txt","r");
   
   
    fp2=fopen("con2.txt","w");
   
   
    fseek(fp2,0,SEEK_END);
   
   
    for(i=0 ; i < 4 ; i++)
    {
        fputs(" ",fp2);
        fputs(arr[i],fp2);
    }
   
    fclose(fp1);
    fclose(fp2);
   
   
return 0;   
}

---

Do you realize that the "w" open mode erases all the contents of the file?

Perhaps you should consider using one of the "append" modes instead?

See this link for more information.

@jimblumberg Thank you !!!I want to be honest I have not ever used "w+" ,"r+" ,"a" until now
I can edit my program if you want?

Quote:

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Perhaps you should consider using one of the "append" modes instead?

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Code:

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fp2 = fopen( "con2.txt", "a" );

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Quote:

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Originally Posted by vg-png

merge text files in C

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Did you mean "Merge" the two files or "Append" them? A Merge usually implies some sort of Alphanumeric insertion.

For data safety, especially during testing, I would recommend copying data from both files to a third file.

Given two source files:

Code:

---

File 1            File 2

Apple              Banana
Carrot            Doughnut
Eclair            Fries

---

A "Merge" into a third file:

Code:

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File 3

Apple
Banana
Carrot
Doughnut
Eclair
Fries

---

An "Append" to a third file:

Code:

---

File 3

Apple
Carrot
Eclair
Banana
Doughnut
Fries

---

Quote:

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Originally Posted by vg-png

Hi I am trying to create a program in which I want to store the words which I have from one text file to another text file but I do not want to delete the elements in which I have to the second file .

---

The way I would do it is to take a list of filenames on the commandline, open them, and write the contents to stdout.
Basically the Unix "cat" command.
User can then do what he wants with the output

It's very easy to write a loop that puts characters to stdout until it hits EOF..