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C Exercises: Copy a file in another name

C File Handling : Exercise-11 with Solution

Write a program in C to copy a file in another name.

Assume that the content of the file test.txt is :                                                                       
test line 1                                                                                                   
test line 2                                                                                                   
test line 3                                                                                                   
test line 4                                                                                                   

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>

void main()
{
	FILE *fptr1, *fptr2;
	char ch, fname1[20], fname2[20];

	printf("\n\n Copy a file in another name :\n");
	printf("----------------------------------\n"); 

	printf(" Input the source file name : ");
	scanf("%s",fname1);

	fptr1=fopen(fname1, "r");
	if(fptr1==NULL)
	{
		printf(" File does not found or error in opening.!!");
		exit(1);
	}
	printf(" Input the new file name : ");
	scanf("%s",fname2);
	fptr2=fopen(fname2, "w");
	if(fptr2==NULL)
	{
		printf(" File does not found or error in opening.!!");
		fclose(fptr1);
		exit(2);
	}
	while(1)
	{
		ch=fgetc(fptr1);
		if(ch==EOF)
		{
			break;
		}
		else
		{
			fputc(ch, fptr2);
		}
	}
	printf(" The file %s  copied successfully in the file %s. \n\n",fname1,fname2);
	fclose(fptr1);
	fclose(fptr2);
	getchar();
}

Sample Output:

 Copy a file in another name :                                                                                
----------------------------------                                                                            
 Input the source file name : test.txt                                                                        
 Input the new file name : test1.txt                                                                          
 The file test.txt  copied successfully in the file test1.txt.

Flowchart:

Flowchart: Copy a file in another name

C Programming Code Editor:

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Previous: Write a program in C to append multiple lines at the end of a text file.
Next: Write a program in C to merge two files and write it in a new file.

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C Programming: Tips of the Day

Difference between signed / unsigned char :

There's no dedicated "character type" in C language. char is an integer type, same (in that regard) as int, short and other integer types. char just happens to be the smallest integer type. So, just like any other integer type, it can be signed or unsigned.

It is true that (as the name suggests) char is mostly intended to be used to represent characters. But characters in C are represented by their integer "codes", so there's nothing unusual in the fact that an integer type char is used to serve that purpose.

The only general difference between char and other integer types is that plain char is not synonymous with signed char, while with other integer types the signed modifier is optional/implied.

Ref : https://bit.ly/3esiVjT