Topic: reading multiple text files
Author: annpapajohn@gmail.com
Date: Wed, 3 May 2017 08:22:36 -0700 (PDT)
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i want to write a program that reads the content of two 2d matrices from
two different text files and then writes their sum in another text
file.here is the progress i've made so far:
*#include <iostream>*
*#include <fstream>*
*using namespace std;*
*int main()*
*{*
*int i,j;*
* int a[5][5]; *
* ifstream in("matrix_a.txt");*
* for (i=0; i<5; i++)*
* for (j=0; j<5; j++)*
* {in >> a[i][j];*
* cout << a[i][j] << endl;}*
* in.close();*
* int b[5][5]; *
* ifstream in("matrix_b.txt");*
* for (i=0; i<5; i++)*
* for (j=0; j<5; j++)*
* {in >> b[i][j];*
* cout << b[i][j] << endl;}*
* in.close();*
* int sum[5][5];*
* ofstream out("sum.txt");*
*for(i = 0; i < 5; ++i)*
* {for(j = 0; j < 5; ++j)*
* {sum[i][j] = a[i][j] + b[i][j];*
* out << sum [i][j] << endl;}*
* } *
* out.close();*
* return 0;*
*}*
the problem is that after the compilation i get this message :
*---------- Capture Output ----------*
*> "C:\Emerald\gcpp.bat" sum_of_matrices.cpp sum_of_matrices*
*sum_of_matrices.cpp: In function 'int main()':*
*sum_of_matrices.cpp:23:14: error: redeclaration of 'std::ifstream in'*
* ifstream in("matrix_b.txt");*
* ^*
*sum_of_matrices.cpp:11:12: note: 'std::ifstream in' previously declared
here*
* ifstream in("matrix_a.txt");*
* ^*
*> Terminated with exit code 1.*
can anyone please help me understand the message and how to solve this?
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<div dir=3D"ltr">i want to write a program that reads the content of two 2d=
matrices from two different text files and then writes their sum in anothe=
r text file.here is the progress i've made so far:<div><br></div><div><=
div><b>#include <iostream></b></div><div><b>#include <fstream><=
/b></div><div><b>using namespace std;</b></div><div><b><br></b></div><div><=
b>int main()</b></div><div><b>{</b></div><div><b><br></b></div><div><b><br>=
</b></div><div><b>int i,j;</b></div><div><b>=C2=A0int a[5][5];<span class=
=3D"Apple-tab-span" style=3D"white-space:pre"> </span></b></div><div><b>=C2=
=A0<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>ifstrea=
m in("matrix_a.txt");</b></div><div><b>=C2=A0<span class=3D"Apple=
-tab-span" style=3D"white-space:pre"> </span></b></div><div><b>=C2=A0for (i=
=3D0; i<5; i++)</b></div><div><b>=C2=A0<span class=3D"Apple-tab-span" st=
yle=3D"white-space:pre"> </span>for (j=3D0; j<5; j++)</b></div><div><b>=
=C2=A0{in >> a[i][j];</b></div><div><b>=C2=A0cout << a[i][j] &l=
t;< endl;}</b></div><div><b>=C2=A0</b></div><div><b>=C2=A0in.close();</b=
></div><div><b>=C2=A0</b></div><div><b>=C2=A0</b></div><div><b><br></b></di=
v><div><b>=C2=A0int b[5][5];<span class=3D"Apple-tab-span" style=3D"white-s=
pace:pre"> </span></b></div><div><b>=C2=A0<span class=3D"Apple-tab-span" st=
yle=3D"white-space:pre"> </span>ifstream in("matrix_b.txt");</b><=
/div><div><b>=C2=A0<span class=3D"Apple-tab-span" style=3D"white-space:pre"=
> </span></b></div><div><b>=C2=A0for (i=3D0; i<5; i++)</b></div><div><b>=
=C2=A0<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>for =
(j=3D0; j<5; j++)</b></div><div><b>=C2=A0{in >> b[i][j];</b></div>=
<div><b>=C2=A0cout << b[i][j] << endl;}</b></div><div><b>=C2=A0=
</b></div><div><b>=C2=A0in.close();</b></div><div><b>=C2=A0</b></div><div><=
b>=C2=A0</b></div><div><b>=C2=A0int sum[5][5];</b></div><div><b>=C2=A0ofstr=
eam out("sum.txt");</b></div><div><b>=C2=A0<span class=3D"Apple-t=
ab-span" style=3D"white-space:pre"> </span></b></div><div><b>for(i =3D 0; i=
< 5; ++i)</b></div><div><b>=C2=A0 =C2=A0 =C2=A0 =C2=A0 {for(j =3D 0; j =
< 5; ++j)</b></div><div><b>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 {su=
m[i][j] =3D a[i][j] + b[i][j];</b></div><div><b><br></b></div><div><b>=C2=
=A0 =C2=A0<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>=
out << sum [i][j] << endl;}</b></div><div><b>=C2=A0} =C2=A0<spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"> </span></b></div><div=
><b>=C2=A0 =C2=A0<span class=3D"Apple-tab-span" style=3D"white-space:pre"> =
</span>out.close();</b></div><div><b>=C2=A0 =C2=A0<span class=3D"Apple-tab-=
span" style=3D"white-space:pre"> </span></b></div><div><b>=C2=A0 =C2=A0<spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>return 0;</b><=
/div><div><b>}</b></div></div><div><br></div><div><br></div><div>the proble=
m is that after the compilation i get this message :</div><div><div><b>----=
------ Capture Output ----------</b></div><div><b>> "C:\Emerald\gcp=
p.bat" sum_of_matrices.cpp sum_of_matrices</b></div><div><b>sum_of_mat=
rices.cpp: In function 'int main()':</b></div><div><b>sum_of_matric=
es.cpp:23:14: error: redeclaration of 'std::ifstream in'</b></div><=
div><b>=C2=A0 =C2=A0ifstream in("matrix_b.txt");</b></div><div><b=
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ^</b></div><div><b>sum_of=
_matrices.cpp:11:12: note: 'std::ifstream in' previously declared h=
ere</b></div><div><b>=C2=A0 =C2=A0ifstream in("matrix_a.txt");</b=
></div><div><b>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ^</b></div><div><b=
><br></b></div><div><b>> Terminated with exit code 1.</b></div></div><di=
v><br></div><div>can anyone please help me understand the message and how t=
o solve this?</div></div>
<p></p>
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%40isocpp.org</a>.<br />
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Author: Nicol Bolas <jmckesson@gmail.com>
Date: Wed, 3 May 2017 08:51:00 -0700 (PDT)
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This is not a C++ help forum; it is a forum for discussing proposals for
the C++ language.
--
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<div dir=3D"ltr">This is not a C++ help forum; it is a forum for discussing=
proposals for the C++ language.<br></div>
<p></p>
-- <br />
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..org">std-proposals@isocpp.org</a>.<br />
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om/a/isocpp.org/d/msgid/std-proposals/a5fc218b-4c67-404e-809d-af122728f691%=
40isocpp.org?utm_medium=3Demail&utm_source=3Dfooter">https://groups.google.=
com/a/isocpp.org/d/msgid/std-proposals/a5fc218b-4c67-404e-809d-af122728f691=
%40isocpp.org</a>.<br />
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.
Author: annpapajohn@gmail.com
Date: Wed, 3 May 2017 09:04:12 -0700 (PDT)
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thanks for the information and sorry for bothering
=CE=A4=CE=B7 =CE=A4=CE=B5=CF=84=CE=AC=CF=81=CF=84=CE=B7, 3 =CE=9C=CE=B1=CE=
=90=CE=BF=CF=85 2017 - 6:51:00 =CE=BC.=CE=BC. UTC+3, =CE=BF =CF=87=CF=81=CE=
=AE=CF=83=CF=84=CE=B7=CF=82 Nicol Bolas =CE=AD=CE=B3=CF=81=CE=B1=CF=88=CE=
=B5:
>
> This is not a C++ help forum; it is a forum for discussing proposals for=
=20
> the C++ language.
>
--=20
You received this message because you are subscribed to the Google Groups "=
ISO C++ Standard - Future Proposals" group.
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mail to std-proposals+unsubscribe@isocpp.org.
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..org/d/msgid/std-proposals/0546a7ad-b444-49d2-b107-d27a419ec4cd%40isocpp.or=
g.
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<div dir=3D"ltr">thanks for the information and sorry for bothering<br><br>=
=CE=A4=CE=B7 =CE=A4=CE=B5=CF=84=CE=AC=CF=81=CF=84=CE=B7, 3 =CE=9C=CE=B1=CE=
=90=CE=BF=CF=85 2017 - 6:51:00 =CE=BC.=CE=BC. UTC+3, =CE=BF =CF=87=CF=81=CE=
=AE=CF=83=CF=84=CE=B7=CF=82 Nicol Bolas =CE=AD=CE=B3=CF=81=CE=B1=CF=88=CE=
=B5:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex=
;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr">This is n=
ot a C++ help forum; it is a forum for discussing proposals for the C++ lan=
guage.<br></div></blockquote></div>
<p></p>
-- <br />
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..org">std-proposals@isocpp.org</a>.<br />
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om/a/isocpp.org/d/msgid/std-proposals/0546a7ad-b444-49d2-b107-d27a419ec4cd%=
40isocpp.org?utm_medium=3Demail&utm_source=3Dfooter">https://groups.google.=
com/a/isocpp.org/d/msgid/std-proposals/0546a7ad-b444-49d2-b107-d27a419ec4cd=
%40isocpp.org</a>.<br />
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