printf not print string after \n (Compiler GCC)

Question

See my code

char t[]= "{\n abcdeffgjejgjergnjkengkknkn \n";
printf("%s",t);

char t1[]= "{ abcdeffgjejgjergnjkengkknkn \n aaffdefa";
printf("%s",t1);

Actual Output:

{
{ abcdeffgjejgjergnjkengkknkn

Expected output:

{
 abcdeffgjejgjergnjkengkknkn 
{ abcdeffgjejgjergnjkengkknkn 
 aaffdefa

Can any one help me why string is not getting print after \n (LF)?

Compiler - arm-none-eabi

Library header - Newlib

IDE: MCUExpresso

Some programmer dude · Accepted Answer · 2018-10-30 09:50:35Z

0

By default stdout (where printf writes) is line buffered. That means the output buffer is flushed (actually written) either when it's full or when you print a newline.

That's why the second part of the output isn't printed, because it's not enough to fill the buffer and you have no newline to flush the buffer.

You can flush explicitly yourself by calling fflush:

printf(...);
fflush(stdout);

answered Oct 30, 2018 at 9:50

Some programmer dude

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2 Comments

jtro Over a year ago

but the same is working with other compiler (ARM by Keil)? Do you have any reference code for fflush?

Some programmer dude Over a year ago

@jtro Yes, print a trailing newline or explicitly call fflush.

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