C Exercises: Merge two files and write it in a new file
C File Handling : Exercise-12 with Solution
Write a program in C to merge two files and write it in a new file.
Assume that the content of the file test.txt and test1.txr is : The content of the file test.txt is : This is the file test.txt. The content of the file test1.txt is : This is the file test1.txt.
Sample Solution:
C Code:
#include <stdio.h>
#include <stdlib.h>
void main()
{
FILE *fold1, *fold2, *fnew;
char ch, fname1[20], fname2[20], fname3[30];
printf("\n\n Merge two files and write it in a new file :\n");
printf("-------------------------------------------------\n");
printf(" Input the 1st file name : ");
scanf("%s",fname1);
printf(" Input the 2nd file name : ");
scanf("%s",fname2);
printf(" Input the new file name where to merge the above two files : ");
scanf("%s",fname3);
fold1=fopen(fname1, "r");
fold2=fopen(fname2, "r");
if(fold1==NULL || fold2==NULL)
{
// perror("Error Message ");
printf(" File does not exist or error in opening...!!\n");
exit(EXIT_FAILURE);
}
fnew=fopen(fname3, "w");
if(fnew==NULL)
{
// perror("Error Message ");
printf(" File does not exist or error in opening...!!\n");
exit(EXIT_FAILURE);
}
while((ch=fgetc(fold1))!=EOF)
{
fputc(ch, fnew);
}
while((ch=fgetc(fold2))!=EOF)
{
fputc(ch, fnew);
}
printf(" The two files merged into %s file successfully..!!\n\n", fname3);
fclose(fold1);
fclose(fold2);
fclose(fnew);
}
Sample Output:
Merge two files and write it in a new file : ------------------------------------------------- Input the 1st file name : test.txt Input the 2nd file name : test1.txt Input the new file name where to merge the above two files : mergefiles.txt The two files merged into mergefiles.txt file successfully..!!
Flowchart:

C Programming Code Editor:
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: Write a program in C to copy a file in another name.
Next: Write a program in C to encrypt a text file.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
C Programming: Tips of the Day
What is the size of an enum in c?
An enum is only guaranteed to be large enough to hold int values. The compiler is free to choose the actual type used based on the enumeration constants defined so it can choose a smaller type if it can represent the values you define. If you need enumeration constants that don't fit into an int you will need to use compiler-specific extensions to do so.
Ref : https://bit.ly/3ypg4k8
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework