Thread: puts/fputs

we know that puts automatically provides a newline character after the string and fputs doesn't do so. but i was thinking that is it possible to have a newline character before the string while using puts or fputs, like we use in printf.

yes. does this work? and let's say that i declare a string variable name then does puts("\n"name) works?

Originally Posted by joybanerjee39

yes. does this work?

Try it and see if it does what you want.

and let's say that i declare a string variable name then does puts("\n"name) works?

Nope, the language doesn't allow concatenating strings together like that, no matter whether you're using puts, some other function or no function whatsoever. That sort of concatenation only works with literals, which are the things you put in double quotes " ". You need printf if you're mixing literals and variables.

Originally Posted by anduril462

Nope, the language doesn't allow concatenating strings together like that,

Right, but concatenating string-literals is allowed like

Code:

puts( "\n" "foo" " " "bar" );
or
#define TOSTR(s) #s
#define PRENL(s) "\n" TOSTR(s)
puts( PRENL( name ) ); /* where name is not a variable, it will be quoted to a literal */

Originally Posted by BillyTKid

Right, but concatenating string-literals is allowed like

You clearly didn't finish reading my post:

Originally Posted by anduril462

That sort of concatenation only works with literals, which are the things you put in double quotes " ". You need printf if you're mixing literals and variables.

Code:

puts( "\n" "foo" " " "bar" );
or
#define TOSTR(s) #s
#define PRENL(s) "\n" TOSTR(s)
puts( PRENL( name ) ); /* where name is not a variable, it will be quoted to a literal */

Not sure if this is what you intended, but PRENL(name) will always produce "\nname" regardless of the contents of the name variable (or lack of variable). Try it and see for yourself.