How to insert new line text in a file?

fid1 = fopen('sample1.txt', 'a');

fprintf(fid1, '\n First line a b c d e f g h\n');

fclose(fid1);

fid2 = fopen('sample2.txt', 'a');

fprintf(fid2, '');

fprintf(fid2, '\nNew message in new line\n');

fclose(fid2);

Merge those two files into single file sample3.txt

I want to print those two lines one by one like below:

First line a b c d e f g h

New message in new line

Kindly do the needful

[Ameer Hamza]

What is the error in your code? Also, there is no need to use two newlines.

[leo john]

Suppose if i want to merge two files each file containing one line, after merging it i want the file with two separate lines which i am not able to done. Instead it is printing in the same line.