Question

How to duplicate (copy) text file in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
   
int main(int argc, char **argv) 
{ 
    FILE *f, *copy_f;
    int ch;

    f = fopen("d:\\data.txt", "r");
    copy_f = fopen("d:\\data_copy.txt", "w");
    if( !f || !copy_f)
    {
        puts("File open error");
        exit(1);
    }
    while( (ch = fgetc(f)) != EOF)
        fputc(ch, copy_f);

    puts("File duplicated");

    fclose(f);
    fclose(copy_f);

    return 0;
}
   
/*
  
run:
   
File duplicated

*/

 

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Answer 2

#include <stdio.h>
    
int copy_files(char *src, char *target);  
    
int main(int argc, char **argv) 
{ 
    if (copy_files("d:\\data.txt", "d:\\data_copy.txt"))
        puts("File duplicated");
    else
        puts("File open error");
 
    return 0;
}
 
int copy_files(char *src, char *target)
{
    FILE *f, *copy_f;
    int ch;
 
    f = fopen(src, "r");
    copy_f = fopen(target, "w");
    if( !f || !copy_f)
        return 0;
     
    while( (ch = fgetc(f)) != EOF)
        fputc(ch, copy_f); 

    fclose(f);
    fclose(copy_f);
     
    return 1;
}
    
/*
   
run:
    
File duplicated
 
*/

 

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Answer 3

#include <stdio.h>
#include <unistd.h>
    
int copy_files(char *src, char *target);  
    
int main(int argc, char **argv) 
{ 
    if (copy_files("d:\\data.txt", "d:\\data_copy.txt"))
        puts("File duplicated\n");
    else
        puts("File didn't duplicated\n");
 
    return 0;
}
 
int copy_files(char *src, char *target)
{
    FILE *f, *copy_f;
    int ch;
 
    if ( access( src, F_OK ) == -1 ) {
        printf("file %s doesn't exist\n", src);
        return 0;
    }
    f = fopen(src, "r");
    copy_f = fopen(target, "w");
    if( !f || !copy_f)
        return 0;
     
    while( (ch = fgetc(f)) != EOF)
        fputc(ch, copy_f); 

    fclose(f);
    fclose(copy_f);
     
    return 1;
}
    
/*
   
run:
    
file d:\data.txt doesn't exist
File didn't duplicated
 
*/

 

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