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); } 

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

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

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