why printf works first than cout

[pai]

Hi,

This is a code . the output will be
why is this so. Can any nody explain me this..
4444 2222 7777 8888
aaaa

*************** *************** *
#include <stdio.h>
#include<iostre am.h>

int main(void)
{

char* test = "4444 2222 7777 8888";
cout<<"aaaa";
printf("New string: %s\n", test);

return 0;
}
*************** *************** ***
thanks

Pai...

[Pete Becker]

Thomas J. Gritzan wrote:

pai schrieb:

>>Hi,

This is a code . the output will be
why is this so. Can any nody explain me this..
4444 2222 7777 8888
aaaa

************* *************** ***
#include <stdio.h>

Should be <cstdio>

<stdio.hworks just fine here. Changing to <cstdiowould require
adding std:: to the call to printf.

>

>>#include<iost ream.h>

Should be <iostream>

This is actually the problem, obscured by the gratuitous style advice
that surrounds it.

>

>>int main(void)

Should be

int main()

They mean the same thing.

>
Usually, both printf and cout are buffered. printf flushes the buffer on a
newline ('\n'), and cout flushes by calling flush() member function, or by
using:

std::cout << std::endl; // and:
std::cout << std::flush;

And, gasp, printf and insertions to cout are synchronized! The problem
isn't in mixing them. That works just fine. The problem is the use of an
old streams library, through <iostream.h>.

In general, it's a bad idea to mix C and C++ standard library stuff.

Not at all.

[Pete Becker]

Jim Langston wrote:

>
Because you are not flushing cout. Either add std::endl; to the end (which
adds a newline and then does cout.flush()) or if you don't want to add the
newline, just do the flush manually.

That might be what's needed to use the non-standard global name cout
(which is what the original program uses), but the standard stream
std::cout is synchronized with stdout, and will get the order right. No
flush gymnastics needed.

[Gavin Deane]

Thomas J. Gritzan wrote:

pai schrieb:

#include <stdio.h>

Should be <cstdio>

Only if

printf("New string: %s\n", test);

is changed to

std::printf("Ne w string: %s\n", test);

or you are using a compiler that implements <cxxxheaders incorrectly,
putting names in the std and global namespaces, in which case
preference for <cxxxgains you nothing.

Gavin Deane