C Program to Merge Alternate Lines from Two Files

This C Program merges lines alternatively from 2 files & print result.

Here is source code of the C Program to merge lines alternatively from 2 files & print result. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C Program that Merges Lines Alternatively from 2 Files & Print Result
  3.  */
  4. #include<stdio.h>
  5. main()
  6. {
  7.     char file1[10], file2[10];
  8.  
  9.     puts("enter the name of file 1");      /*getting the names of file to be concatenated*/
  10.     scanf("%s", file1);
  11.     puts("enter the name of file 2");
  12.     scanf("%s", file2);
  13.     FILE *fptr1, *fptr2, *fptr3;
  14.     fptr1=fopen(file1, "r");             /*opening the files in read only mode*/
  15.     fptr2=fopen(file2, "r");
  16.     fptr3=fopen("merge2.txt", "w+");   /*opening a new file in write,update mode*/
  17.     char str1[200];
  18.     char ch1, ch2;
  19.     int n = 0, w = 0;
  20.     while (((ch1=fgetc(fptr1)) != EOF) && ((ch2 = fgetc(fptr2)) != EOF))
  21.     {
  22.         if (ch1 != EOF)             /*getting lines in alternately from two files*/
  23.         {
  24.             ungetc(ch1, fptr1);
  25.             fgets(str1, 199, fptr1);
  26.             fputs(str1, fptr3);
  27.             if (str1[0] != 'n')
  28.                 n++;      /*counting no. of lines*/
  29.         }
  30.         if (ch2 != EOF)
  31.         {
  32.             ungetc(ch2, fptr2);
  33.             fgets(str1, 199, fptr2);
  34.             fputs(str1, fptr3);
  35.             if (str1[0] != 'n')
  36.                 n++;        /*counting no.of lines*/
  37.         }
  38.     }
  39.     rewind(fptr3);
  40.     while ((ch1 = fgetc(fptr3)) != EOF)       /*countig no.of words*/
  41.     {
  42.         ungetc(ch1, fptr3);
  43.         fscanf(fptr3, "%s", str1);
  44.         if (str1[0] != ' ' || str1[0] != 'n')
  45.             w++;
  46.     }
  47.     fprintf(fptr3, "\n\n number of lines = %d n number of words is = %d\n", n, w - 1);
  48.     /*appendig comments in the concatenated file*/
  49.     fclose(fptr1);
  50.     fclose(fptr2);
  51.     fclose(fptr3);
  52. }

$ cc pgm51.c
$ a.out
enter the name of file 1
c.txt
enter the name of file 2
a.txt
$ vi merge2.txt
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 number of lines = 4
 number of words is = 114

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If you wish to look at other example programs on File Handling, go to File Handling. If you wish to look at programming examples on all topics, go to C Programming Examples.

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