Read File and store in a array of chars - c++
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I'm trying to open a file and save the information there in an array of chars, however I'm not getting it. To save in a string use this:
int main()
string line1;
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(getline(myfile,line1))
ReadFile(myfile);
And It works.
When I use an array of chars, I code like this:
int main()
int size=100;
char line1[size];
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(myfile.peek()!EOF)
line1[size]->ReadFile();
The function ReadFile is this:
void ReadFile(ifstream &is)
char aux[100];
is.getline(aux,100);
c++ arrays char readfile ifstream
|
show 7 more comments
up vote
0
down vote
favorite
I'm trying to open a file and save the information there in an array of chars, however I'm not getting it. To save in a string use this:
int main()
string line1;
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(getline(myfile,line1))
ReadFile(myfile);
And It works.
When I use an array of chars, I code like this:
int main()
int size=100;
char line1[size];
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(myfile.peek()!EOF)
line1[size]->ReadFile();
The function ReadFile is this:
void ReadFile(ifstream &is)
char aux[100];
is.getline(aux,100);
c++ arrays char readfile ifstream
myfile.peek()!EOF
doesn't seem right.line1[size]->myfile;
is also weird.
– Quimby
Nov 10 at 18:09
1
Don't use an array of chars then - a string is the correct thing to use here. Also,char line1[size];
is not valid C++ code.
– Neil Butterworth
Nov 10 at 18:10
I've used it in other programs and it worked. Do you have any suggestions? @Quimby
– Alice
Nov 10 at 18:10
@NeilButterworth I need to use chars to implement another function that counts the number of chars in the file
– Alice
Nov 10 at 18:11
Use stringstreams to read whole files. stackoverflow.com/questions/2602013/…
– Quimby
Nov 10 at 18:12
|
show 7 more comments
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm trying to open a file and save the information there in an array of chars, however I'm not getting it. To save in a string use this:
int main()
string line1;
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(getline(myfile,line1))
ReadFile(myfile);
And It works.
When I use an array of chars, I code like this:
int main()
int size=100;
char line1[size];
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(myfile.peek()!EOF)
line1[size]->ReadFile();
The function ReadFile is this:
void ReadFile(ifstream &is)
char aux[100];
is.getline(aux,100);
c++ arrays char readfile ifstream
I'm trying to open a file and save the information there in an array of chars, however I'm not getting it. To save in a string use this:
int main()
string line1;
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(getline(myfile,line1))
ReadFile(myfile);
And It works.
When I use an array of chars, I code like this:
int main()
int size=100;
char line1[size];
ifstream myfile;
myfile.open("example.txt");
if(!myfile)
cout<<"Unable to open the file."<<endl;
exit(0);
while(myfile.peek()!EOF)
line1[size]->ReadFile();
The function ReadFile is this:
void ReadFile(ifstream &is)
char aux[100];
is.getline(aux,100);
c++ arrays char readfile ifstream
c++ arrays char readfile ifstream
edited Nov 10 at 18:36
asked Nov 10 at 18:08
Alice
97
97
myfile.peek()!EOF
doesn't seem right.line1[size]->myfile;
is also weird.
– Quimby
Nov 10 at 18:09
1
Don't use an array of chars then - a string is the correct thing to use here. Also,char line1[size];
is not valid C++ code.
– Neil Butterworth
Nov 10 at 18:10
I've used it in other programs and it worked. Do you have any suggestions? @Quimby
– Alice
Nov 10 at 18:10
@NeilButterworth I need to use chars to implement another function that counts the number of chars in the file
– Alice
Nov 10 at 18:11
Use stringstreams to read whole files. stackoverflow.com/questions/2602013/…
– Quimby
Nov 10 at 18:12
|
show 7 more comments
myfile.peek()!EOF
doesn't seem right.line1[size]->myfile;
is also weird.
– Quimby
Nov 10 at 18:09
1
Don't use an array of chars then - a string is the correct thing to use here. Also,char line1[size];
is not valid C++ code.
– Neil Butterworth
Nov 10 at 18:10
I've used it in other programs and it worked. Do you have any suggestions? @Quimby
– Alice
Nov 10 at 18:10
@NeilButterworth I need to use chars to implement another function that counts the number of chars in the file
– Alice
Nov 10 at 18:11
Use stringstreams to read whole files. stackoverflow.com/questions/2602013/…
– Quimby
Nov 10 at 18:12
myfile.peek()!EOF
doesn't seem right. line1[size]->myfile;
is also weird.– Quimby
Nov 10 at 18:09
myfile.peek()!EOF
doesn't seem right. line1[size]->myfile;
is also weird.– Quimby
Nov 10 at 18:09
1
1
Don't use an array of chars then - a string is the correct thing to use here. Also,
char line1[size];
is not valid C++ code.– Neil Butterworth
Nov 10 at 18:10
Don't use an array of chars then - a string is the correct thing to use here. Also,
char line1[size];
is not valid C++ code.– Neil Butterworth
Nov 10 at 18:10
I've used it in other programs and it worked. Do you have any suggestions? @Quimby
– Alice
Nov 10 at 18:10
I've used it in other programs and it worked. Do you have any suggestions? @Quimby
– Alice
Nov 10 at 18:10
@NeilButterworth I need to use chars to implement another function that counts the number of chars in the file
– Alice
Nov 10 at 18:11
@NeilButterworth I need to use chars to implement another function that counts the number of chars in the file
– Alice
Nov 10 at 18:11
Use stringstreams to read whole files. stackoverflow.com/questions/2602013/…
– Quimby
Nov 10 at 18:12
Use stringstreams to read whole files. stackoverflow.com/questions/2602013/…
– Quimby
Nov 10 at 18:12
|
show 7 more comments
1 Answer
1
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oldest
votes
up vote
0
down vote
To read in an array of characters, or text, you can use std::getline
and std::string
:
std::string text;
std::getline(myfile, text);
To process text lines in a file:
std::string text;
while (std::getline(myfile, text))
Process_Text(text);
Don't use arrays of characters, as they can overflow. Also, instead of using ==
to compare, you'll have to use strcmp
. Always verify that your array of characters is terminated by a nul character, ''
, otherwise the string functions will go beyond your array, not stopping until a nul is found.
Edit 1: Space separated
To read in text that is space separated, use:
std::string text;
myfile >> text;
Edit 2: Counting characters in a string
You can count characters in a string by using another array.
unsigned int frequency[128] = 0; // Let's assume ASCII, one slot for each character.
// ... read in string
const size_t length(text.length());
for (size_t index = 0; index < length; ++index)
const char letter = text[index];
++frequency[letter];
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
To read in an array of characters, or text, you can use std::getline
and std::string
:
std::string text;
std::getline(myfile, text);
To process text lines in a file:
std::string text;
while (std::getline(myfile, text))
Process_Text(text);
Don't use arrays of characters, as they can overflow. Also, instead of using ==
to compare, you'll have to use strcmp
. Always verify that your array of characters is terminated by a nul character, ''
, otherwise the string functions will go beyond your array, not stopping until a nul is found.
Edit 1: Space separated
To read in text that is space separated, use:
std::string text;
myfile >> text;
Edit 2: Counting characters in a string
You can count characters in a string by using another array.
unsigned int frequency[128] = 0; // Let's assume ASCII, one slot for each character.
// ... read in string
const size_t length(text.length());
for (size_t index = 0; index < length; ++index)
const char letter = text[index];
++frequency[letter];
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
add a comment |
up vote
0
down vote
To read in an array of characters, or text, you can use std::getline
and std::string
:
std::string text;
std::getline(myfile, text);
To process text lines in a file:
std::string text;
while (std::getline(myfile, text))
Process_Text(text);
Don't use arrays of characters, as they can overflow. Also, instead of using ==
to compare, you'll have to use strcmp
. Always verify that your array of characters is terminated by a nul character, ''
, otherwise the string functions will go beyond your array, not stopping until a nul is found.
Edit 1: Space separated
To read in text that is space separated, use:
std::string text;
myfile >> text;
Edit 2: Counting characters in a string
You can count characters in a string by using another array.
unsigned int frequency[128] = 0; // Let's assume ASCII, one slot for each character.
// ... read in string
const size_t length(text.length());
for (size_t index = 0; index < length; ++index)
const char letter = text[index];
++frequency[letter];
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
add a comment |
up vote
0
down vote
up vote
0
down vote
To read in an array of characters, or text, you can use std::getline
and std::string
:
std::string text;
std::getline(myfile, text);
To process text lines in a file:
std::string text;
while (std::getline(myfile, text))
Process_Text(text);
Don't use arrays of characters, as they can overflow. Also, instead of using ==
to compare, you'll have to use strcmp
. Always verify that your array of characters is terminated by a nul character, ''
, otherwise the string functions will go beyond your array, not stopping until a nul is found.
Edit 1: Space separated
To read in text that is space separated, use:
std::string text;
myfile >> text;
Edit 2: Counting characters in a string
You can count characters in a string by using another array.
unsigned int frequency[128] = 0; // Let's assume ASCII, one slot for each character.
// ... read in string
const size_t length(text.length());
for (size_t index = 0; index < length; ++index)
const char letter = text[index];
++frequency[letter];
To read in an array of characters, or text, you can use std::getline
and std::string
:
std::string text;
std::getline(myfile, text);
To process text lines in a file:
std::string text;
while (std::getline(myfile, text))
Process_Text(text);
Don't use arrays of characters, as they can overflow. Also, instead of using ==
to compare, you'll have to use strcmp
. Always verify that your array of characters is terminated by a nul character, ''
, otherwise the string functions will go beyond your array, not stopping until a nul is found.
Edit 1: Space separated
To read in text that is space separated, use:
std::string text;
myfile >> text;
Edit 2: Counting characters in a string
You can count characters in a string by using another array.
unsigned int frequency[128] = 0; // Let's assume ASCII, one slot for each character.
// ... read in string
const size_t length(text.length());
for (size_t index = 0; index < length; ++index)
const char letter = text[index];
++frequency[letter];
edited Nov 10 at 19:04
answered Nov 10 at 18:20
Thomas Matthews
44k1171122
44k1171122
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
add a comment |
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
And then I can use the string text to count each char have the text?
– Alice
Nov 10 at 18:23
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
See my Edit 2.
– Thomas Matthews
Nov 10 at 19:04
add a comment |
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myfile.peek()!EOF
doesn't seem right.line1[size]->myfile;
is also weird.– Quimby
Nov 10 at 18:09
1
Don't use an array of chars then - a string is the correct thing to use here. Also,
char line1[size];
is not valid C++ code.– Neil Butterworth
Nov 10 at 18:10
I've used it in other programs and it worked. Do you have any suggestions? @Quimby
– Alice
Nov 10 at 18:10
@NeilButterworth I need to use chars to implement another function that counts the number of chars in the file
– Alice
Nov 10 at 18:11
Use stringstreams to read whole files. stackoverflow.com/questions/2602013/…
– Quimby
Nov 10 at 18:12