Copy one File data into Another File in C ~ GNIITHELP

Program to Copy Content of One File into Another File

We already know how to open a file, read contents of a file and write into a file. So in this program, we will read from one file and simultaneously write into the other file, till we reach end of first file.

#include<stdio.h>

void main()
{   
    /*
    File_1.txt is the file with content and,
    File_2.txt is the file in which content of File_1
    will be copied.
    */
    FILE *fp1, *fp2;
    char ch;
    int pos;
 
    if ((fp1 = fopen("File_1.txt","r")) == NULL)    
    {    
        printf("\nFile cannot be opened");
        return;
    }
    else     
    {
        printf("\nFile opened for copy...\n ");    
    }
    fp2 = fopen("File_2.txt", "w");  
    fseek(fp1, 0L, SEEK_END); // file pointer at end of file
    pos = ftell(fp1);
    fseek(fp1, 0L, SEEK_SET); // file pointer set at start
    while (pos--)
    {
        ch = fgetc(fp1);  // copying file character by character
        fputc(ch, fp2);
    }    
    fcloseall();    
}

To learn about File Handling in C, Visit the studytonight Lesson : File Handling in C