fprintf format

[Gary Wessle]

Hi

I am trying to pretty print to file 3 vectors (int,double,dou ble)
where all the cells match like a table format where every thing lines
up to the left and space padded to the right.
does c++ has something or mostly use C fprintf?

1255251 0.251025 215.2541
thats how I like it to look, where the space is to the right of the
number and the number left aligns with the field border.

here is my patented effort

int main() {
sync_with_stdio (); //to mix C and C++

ofstream out("output.txt ")
for (int i=0; i<vect.size(); i++){
fprintf(out,
"%d8 %f8 %f8"
,vect1[i], vect2[i], vect3[i])
}}

thanks for helping

[Victor Bazarov]

Gary Wessle wrote:

I am trying to pretty print to file 3 vectors (int,double,dou ble)
where all the cells match like a table format where every thing lines
up to the left and space padded to the right.
does c++ has something or mostly use C fprintf?

1255251 0.251025 215.2541
thats how I like it to look, where the space is to the right of the
number and the number left aligns with the field border.

here is my patented effort

int main() {
sync_with_stdio (); //to mix C and C++

ofstream out("output.txt ")
for (int i=0; i<vect.size(); i++){
fprintf(out,
"%d8 %f8 %f8"

Any width you need should be placed between the % sign and the format
specifier ('d' or 'f'): %8d %8f. RTFM, please.

,vect1[i], vect2[i], vect3[i])
}}

thanks for helping

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Gary Wessle]

"Victor Bazarov" <v.********@com Acast.netwrites :

Gary Wessle wrote:

I am trying to pretty print to file 3 vectors (int,double,dou ble)
where all the cells match like a table format where every thing lines
up to the left and space padded to the right.
does c++ has something or mostly use C fprintf?

1255251 0.251025 215.2541
thats how I like it to look, where the space is to the right of the
number and the number left aligns with the field border.

here is my patented effort

int main() {
sync_with_stdio (); //to mix C and C++

ofstream out("output.txt ")
for (int i=0; i<vect.size(); i++){
fprintf(out,
"%d8 %f8 %f8"

Any width you need should be placed between the % sign and the format
specifier ('d' or 'f'): %8d %8f. RTFM, please.

,vect1[i], vect2[i], vect3[i])
}}

thanks for helping

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

after all kind of trial and error, I wish I could find some
step-by-step gentle into to the fprintf with lots of examples for
the dummy.

but here it is for the records, in c++ and not c

*************** *************** *************** *************** ****
#include "boost/format.hpp"
using boost::format;

ofstream out("output.txt ");
format fmter("%1% %12t%2% %25t%3%\n");//very close to fprintf format

for(unsigned i=0; i<vect1.size() ; i++){
fmter % vect1[i];
fmter % vect2[i];
fmter % vect3[i];
exp << fmter.str();
}

I came to this after reading as much as I can understand from the
manual.

[Marcus Kwok]

Gary Wessle <ph****@yahoo.c omwrote:

I am trying to pretty print to file 3 vectors (int,double,dou ble)
where all the cells match like a table format where every thing lines
up to the left and space padded to the right.
does c++ has something or mostly use C fprintf?

1255251 0.251025 215.2541
thats how I like it to look, where the space is to the right of the
number and the number left aligns with the field border.

here is my patented effort

int main() {
sync_with_stdio (); //to mix C and C++

ofstream out("output.txt ")
for (int i=0; i<vect.size(); i++){
fprintf(out,
"%d8 %f8 %f8"
,vect1[i], vect2[i], vect3[i])
}}

Look into using the facilities provided by the <iomanipheade r.

--
Marcus Kwok
Replace 'invalid' with 'net' to reply

[mlimber]

Gary Wessle wrote:

after all kind of trial and error, I wish I could find some
step-by-step gentle into to the fprintf with lots of examples for
the dummy.

but here it is for the records, in c++ and not c

*************** *************** *************** *************** ****
#include "boost/format.hpp"
using boost::format;

ofstream out("output.txt ");
format fmter("%1% %12t%2% %25t%3%\n");//very close to fprintf format

for(unsigned i=0; i<vect1.size() ; i++){
fmter % vect1[i];
fmter % vect2[i];
fmter % vect3[i];
exp << fmter.str();
}

I came to this after reading as much as I can understand from the
manual.

Why not use std::cout instead? It's standard (unlike Boost), type-safe,
and is preferred in C++ land. Consult your C++ reference (if you don't
have one, get one recommended at accu.org) on how to use the items in
the iomanip header to achieve the same effect in a more idiomatic C++
way.

Cheers! --M

[Gary Wessle]

Gary Wessle <ph****@yahoo.c omwrites:

"Victor Bazarov" <v.********@com Acast.netwrites :

Gary Wessle wrote:

I am trying to pretty print to file 3 vectors (int,double,dou ble)
where all the cells match like a table format where every thing lines
up to the left and space padded to the right.
does c++ has something or mostly use C fprintf?
>
1255251 0.251025 215.2541
thats how I like it to look, where the space is to the right of the
number and the number left aligns with the field border.
>
here is my patented effort
>
int main() {
sync_with_stdio (); //to mix C and C++
>
ofstream out("output.txt ")
for (int i=0; i<vect.size(); i++){
fprintf(out,
"%d8 %f8 %f8"

Any width you need should be placed between the % sign and the format
specifier ('d' or 'f'): %8d %8f. RTFM, please.

,vect1[i], vect2[i], vect3[i])
}}
>
thanks for helping

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

after all kind of trial and error, I wish I could find some
step-by-step gentle into to the fprintf with lots of examples for
the dummy.

but here it is for the records, in c++ and not c

*************** *************** *************** *************** ****
#include "boost/format.hpp"
using boost::format;

ofstream out("output.txt ");
format fmter("%1% %12t%2% %25t%3%\n");//very close to fprintf format

for(unsigned i=0; i<vect1.size() ; i++){
fmter % vect1[i];
fmter % vect2[i];
fmter % vect3[i];
exp << fmter.str();
}

I came to this after reading as much as I can understand from the
manual.

correction
the last line of the above code should be
out << fmter.str();