Write a C program to merge the contents of two files into a third file DATA

Two files DATA1 and DATA2 contain sorted lists of integers. Write a C program to merge the contents of two files into a third file DATA i.e., the contents of the first file followed by those of the second are put in the third file.

Program Code:

#include<stdio.h>

void main()

{

FILE *fp1, *fp2,*fp3;

char ch;

fp1=fopen("program.txt","r");

fp2=fopen("new.txt","r");

fp3=fopen("merge.txt","a");

if(fp1==NULL||fp2==NULL||fp3==NULL)

{

printf("file opening problem");

return;

}

while(!feof(fp1))

{

ch=fgetc(fp1);

fputc(ch,fp3);

}

}