c - Prevent line being printed to command line pipe to file -

the title maybe little confusing.. here attempt of explaining it:

i have command program:

c file1.txt > file2.txt

this command in commandline takes first file , pipes output of program (that printed) second file.

so im scanning user message in:

printf("enter message:"); char *message = malloc(sizeof(char) * 256); scanf("%s", message); printf("your message is: %s", message);

but prints both printf(...) statements piped file, whereas want second one. how can prevent this?

thanks!

one way use stderr information don't want copied output file:

fprintf(stderr, "enter message:");

Ben