Write a C program to copy the contents of one file to another

In this article, we will write a C program to copy the contents of one file to another.

Algorithm: 

Step 1: Start 

Step 2: read command-line arguments 

Step 3: check if no of the arguments =3 or not. If not print invalid no of arguments 

Step 4: open source file in reading mode 

Step 5: if NULL pointer, then print source file can not be open 

Step 6: open destination file in write mode 

Step 7: if NULL pointer, then print destination file can not be open 

Step 8 : read a character from the source file and write it to the destination file until EOF 

Step 9: Close the source file and destination file 

Step 10: Stop 

Write a C program to copy the contents of one file to another

#include <stdio.h>
#include <process.h>
#include <conio.h>

void main()
{
	FILE *ft, *fs;
	int c = 0;
	clrscr();
	fs = fopen("a.txt", "r");
	ft = fopen("b.txt", "w");
	if (fs == NULL)
	{
		printf("Source file opening error\n");
		exit(1);
	}
	else
	if (ft == NULL)
	{
		printf("Target file opening error\n");
		exit(1);
	}
	while (!feof(fs))
	{
		fputc(fgetc(fs), ft);
		c++;
	}
	printf("%d bytes copied from 'a.txt' to 'b.txt'", c);
	c = fcloseall();
	printf("%d files closed", c);
}

INPUT:

a.txt
An array is a collection of elements of similar datatypes

OUTPUT:

57 bytes copied from ‘a.txt’ to ‘b.txt’
2 files closed 

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