Question

Write an interactive C program to append the contents of a file at the end
of another file without using any built-in functions.

Answer 1

This C Program appends the content of file at the end of another.

Here is source code of the C Program to append the content of file at the end of another. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/* * C Program to Append the Content of File at the end of Another */#include <stdio.h>#include <stdlib.h> main(){ FILE *fsring1, *fsring2, *ftemp; char ch, file1[20], file2[20], file3[20];  printf("Enter name of first file "); gets(file1); printf("Enter name of second file "); gets(file2); printf("Enter name to store merged file "); gets(file3); fsring1 = fopen(file1, "r"); fsring2 = fopen(file2, "r"); if (fsring1 == NULL || fsring2 == NULL) { perror("Error has occured"); printf("Press any key to exit...\n"); exit(EXIT_FAILURE); } ftemp = fopen(file3, "w"); if (ftemp == NULL) { perror("Error has occures"); printf("Press any key to exit...\n"); exit(EXIT_FAILURE); } while ((ch = fgetc(fsring1)) != EOF) fputc(ch, ftemp); while ((ch = fgetc(fsring2) ) != EOF) fputc(ch, ftemp); printf("Two files merged %s successfully.\n", file3); fclose(fsring1); fclose(fsring2); fclose(ftemp); return 0;}

$ cc pgm47.c $ a.out Enter name of first file a.txt Enter name of second file b.txt Enter name to store merged file merge.txt Two files merged merge.txt successfully