Question

Write a C program to merge two files into a third file (i.e., the contents of the first file followed by those of the second are put in the third file)

Answer 1

Merge Two Files

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Following is the program to copy contents of two files into a third file.

Example :

#include<iostream.h> #include<conio.h> #include<fstream.h> #include<stdio.h> #include<stdlib.h> void main() { clrscr(); ifstream fs; ofstream ft; char ch, fname1[20],fname2[20],fname3[20]; cout<<"Enter first file name with extension (like files.txt) : "; gets(fname1); fs.open(fname1,ios::in); if(!fs) { cout<<"Error in opening source file..!!"; getch(); exit(1); } cout<<"Enter second file name with extension (like files.txt) : "; gets(fname2); cout<<"Enter target file name with extension (like filet.txt) : "; gets(fname3); ft.open(fname3,ios::app); if(!ft) { cout<<"Error in opening target file..!!"; fs.close(); getch(); exit(2); } while(fs.eof()==0) { fs>>ch; ft<<ch; } fs.close(); fs.open(fname2,ios::in); if(!fs) { cout<<"Error in opening source file..!!"; getch(); exit(1); } while(fs.eof()==0) { fs>>ch; ft<<ch; } cout<<"File copied successfully..!!"; fs.close(); ft.close(); getch(); }

Output :

Before :

After :

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