End line character not executed

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MFC

VisualC++

I have designed one dialogue based MFC application, in which there is condition on '\n' new line character,it executed on my desktop but it not working on other machines!I write code as given below:

fprintf(fp_out,"%c",c5);
        fprintf(fp_out,"%c",c6);
        fprintf(fp_out,"%c",c7);
        fprintf(fp_out,"%c",c8);
        fprintf(fp_out,"%c",'\n');

Last line '\n' takes two bytes while executing,why it not working on others machines! is there any specific condition for that? please suggest
Thanks in advance!