- C++ Programming Examples
- C++ Programming Examples
- C++ Hello World
- C++ Get Input
- C++ Print Integer
- C++ Add Two Numbers
- C++ Add Sub Mul Div
- C++ Add Digits
- C++ Find Average Perc
- C++ Find Arithmetic Mean
- C++ Sum of n Natural Numbers
- C++ Sum of n Numbers
- C++ Area Perimeter of Square
- C++ Area Perimeter of Rectangle
- C++ Area Perimeter of Triangle
- C++ Area Circum of Circle
- C++ Find Simple Interest
- C++ Fahrenheit to Celsius
- C++ Celsius to Fahrenheit
- C++ Print Prime Numbers
- C++ Reverse a Number
- C++ Swap Two Numbers
- C++ Print Multiplication Table
- C++ Find Factorial of Number
- C++ Find Factors of Number
- C++ Find HCF & LCM
- C++ Make Calculator
- C++ Count Digits in Number
- C++ Sum of First & Last Digit
- C++ Product of Digits of Number
- C++ Sum of Squares of Digits
- C++ Interchange Digits of Number
- C++ if else Programs
- C++ Check Even or Odd
- C++ Check Prime or Not
- C++ Check Alphabet or Not
- C++ Check Vowel or Not
- C++ Check Leap Year or Not
- Check Reverse equal Original
- C++ Check Perfect Number
- C++ Check Palindrome or Not
- C++ Check Armstrong or Not
- C++ Divisibility Test
- C++ Find Wage of Labor
- C++ Find Discounted Price
- C++ Find Shipping Charge
- C++ Find Telephone Bills
- C++ Calculate Student Grade
- C++ Largest of Two Numbers
- C++ Largest of Three Numbers
- C++ Number Conversion
- C++ Decimal to Binary
- C++ Decimal to Octal
- C++ Decimal to Hexadecimal
- C++ Binary to Decimal
- C++ Binary to Octal
- C++ Binary to Hexadecimal
- C++ Octal to Decimal
- C++ Octal to Binary
- C++ Octal to Hexadecimal
- C++ Hexadecimal to Decimal
- C++ Hexadecimal to Binary
- C++ Hexadecimal to Octal
- C++ Pattern Programs
- C++ Pattern Programs
- C++ Print Diamond Pattern
- C++ Print Floyd's Triangle
- C++ Print Pascal's Triangle
- C++ Array Programs
- C++ 1D Array Program
- C++ Linear Search
- C++ Binary Search
- Find Largest Element in Array
- Find Smallest Element in Array
- Find Second Largest Element
- Find Second Smallest Element
- C++ Sum of All Elements
- C++ Multiply All Elements
- C++ Element on Even Position
- C++ Element on Odd Position
- C++ Print Even Numbers in Array
- C++ Print Odd Numbers in Array
- C++ Count Even/Odd Numbers
- C++ Sum of Even/Odd Numbers
- C++ Count Positive Negative Zero
- C++ Reverse an Array
- C++ Insert Element in Array
- C++ Delete Element from Array
- C++ Merge two Arrays
- C++ Bubble Sort
- C++ Selection Sort
- C++ Insertion Sort
- C++ Common Elements
- C++ 2D Array Programs
- C++ Add Two Matrices
- C++ Subtract Two Matrices
- C++ Transpose Matrix
- C++ Multiply Two Matrices
- C++ 3D Array Programs
- C++ String Programs
- C++ Print String
- C++ Find Length of String
- C++ Compare Two Strings
- C++ Copy String
- C++ Concatenate String
- C++ Reverse a String
- C++ Delete Vowels from String
- C++ Delete Word from String
- C++ Count Character in String
- C++ Count Word in String
- C++ Frequency of Word
- C++ Remove Spaces from String
- C++ Sort a String
- C++ Uppercase to Lowercase
- C++ Lowercase to Uppercase
- C++ Swap Two Strings
- C++ Check Anagram or Not
- C++ Capitalize All Words in String
- C++ Capitalize Specific Character
- C++ Get Numbers from String
- C++ File Programs
- C++ Read a File
- C++ Write Content to File
- C++ Append Data in File
- C++ Read & Display File
- C++ Copy a File
- C++ Merge Two Files
- Count Characters, Words in File
- C++ Capitalize All Words in File
- C++ List Files in Directory
- C++ Delete a File
- C++ Encrypt & Decrypt a File
- C++ Misc Programs
- C++ Print ASCII Value
- C++ Add Binary Numbers
- C++ Generate Random Numbers
- C++ Print Smiling Face
- C++ Days into Years, Months
- Add Two Numbers using Pointer
- C++ Print Fibonacci Series
- Generate Armstrong Numbers
- C++ Find nCr and nPr
- C++ Get IP Address
- C++ Print Date/Time
- C++ Shutdown, Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
- C++ Programming Test
- C++ Programming Test
- Give Online Test
- All Test List
C++ Program to Merge Two Files
In this article, you will learn and get code to merge the content of any two files into a third file using C++ program. The name of all the three files must be entered by user at run-time.
Things to Do before Program
Because, this article is created to provide you the C++ source code to merge two files, you must have or have to create all the three files inside the current directory. The current directory means, the directory where your C++ source code to merge two files is saved.
Therefore, create the first source file named codes.txt with following content:
This is codes.txt file
And then create second source file named cracker.txt with following content:
This is cracker.txt file
Now create the third file (target file) without any content (empty content). The name of third file is codescracker.txt.
You can name the file with your choice whatever you want. But remember to provide the name of these files while executing the program given below to merge the content of two files into a third file.
Because I'm going to save my C++ source code given below (to merge two files) in cpp programs folder present inside its parent directory named Documents in C-Drive of my computer system. Here is the snapshot of the folder cpp programs:
As you can see, there are three newly created file inside the folder cpp programs. And here is the snapshot of all the three files with its content:
As you can clearly see, that the content inside codes.txt and cracker.txt is available, but codescracker.txt file is completely empty. Now let's move on to the program, to merge the content of two files into the third (target) file.
Merge Contents of Two Files into a Third File
To merge two files in C++ programming, you have to ask from user to enter the name of all the three files with extension, as shown in the program given below:
To do the task of merging, first receive the name of two files, and open it in reading mode. If both files gets opened successfully, then further receive the input as name of third or target file.
The content of first and second file gets copied into the third file one by one as shown in the following program.
The question is, write a program in C++ that merges the content of two files into the third file. Here is its answer:
#include<iostream> #include<fstream> #include<stdio.h> using namespace std; int main() { char fileOne[30], fileTwo[30], fileTarget[30], ch; fstream fpsOne, fpsTwo, fpTarget; cout<<"Enter the Name of First Source File: "; gets(fileOne); cout<<"Enter the Name of Second Source File: "; gets(fileTwo); fpsOne.open(fileOne, fstream::in); fpsTwo.open(fileTwo, fstream::in); if((!fpsOne) || (!fpsTwo)) { cout<<"\nError Occurred (First Source File)!"; return 0; } else { cout<<"\nEnter the Name of Target File: "; gets(fileTarget); fpTarget.open(fileTarget, fstream::out); if(!fpTarget) cout<<"\nError Occurred (Target File)!"; else { while(fpsOne>>noskipws>>ch) fpTarget<<ch; fpTarget<<"\n"; while(fpsTwo>>noskipws>>ch) fpTarget<<ch; cout<<"\nContent of Two File Merged Successfully into Third!"; } } fpsOne.close(); fpsTwo.close(); fpTarget.close(); cout<<endl; return 0; }
This program was build and run under Code::Blocks IDE. Here is its sample run:
Now supply the name of first two source files say codes.txt and cracker.txt. Then enter the name of target file say codescracker.txt to merge the content of first two files into this file. All the three files are created at the early of this article. Now here is the sample output after providing these inputs:
As you can see, the message printed after supply the name of all three files is, Content of Two File Merged Successfully into Third!. Therefore the content of first two source files gets merged into the third file. You can open and see the third (target) file. Here is the snapshot of opened target file, codescracker.txt after executing the above program:
As you can see, the content of two source files gets merged into the target file. There is a newline inserted between both source file's content through the program
But if you don't need to insert a newline between the content of both source file, then just remove the following code from the above program:
fpTarget<<"\n";
to copy the content in as it is manner, without adding some extra things like a newline.
The fstream library allows to work with files. It is defined in fstream header file
The function, open() opens the file. It takes two argument. The first argument is the name of file, which is a required argument, and the second argument is its opening mode, which is an optional argument. The following code:
fpsOne.open(fileOne, fstream::in);
opens the file, fileOne in reading mode. And the file opening mode, fstream::out opens a file in writing mode.
The following statement:
fpsOne>>noskipws>>ch
reads data from file through its stream, fpsOne, in character-by-character manner, without skipping white spaces. And the following statement:
fpTarget<<ch;
writes data to file through its stream, fpTarget.
Same Program in Other Languages
« Previous Program Next Program »