Is there a fscanf equivalent for c++? Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
if(AddressFile. eof()) {
return 0;
}
return next_address;
} //Return the next address being read from a file in the main program
22  4969 
John Phung wrote: Is there a fscanf equivalent for c++?
There is fscanf. ;-)
Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
if(AddressFile. eof()) {
return 0;
What if there is any other special condition than eof?
}
return next_address;
} //Return the next address being read from a file in the main program
--
"Time flies like an arrow. Fruit flies like a banana."
- Groucho Marx
John Phung wrote: Is there a fscanf equivalent for c++?
There is fscanf. ;-)
Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
if(AddressFile. eof()) {
return 0;
What if there is any other special condition than eof?
}
return next_address;
} //Return the next address being read from a file in the main program
--
"Time flies like an arrow. Fruit flies like a banana."
- Groucho Marx
John Phung wrote: Is there a fscanf equivalent for c++? Here's what I'm talking about:
The equivalent of fscanf() in C++ is fscanf(). But don't use it.
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
And here's why you shouldn't use it. If you used this code, your program
would be severely broken. The %x format specifier expects the
corresponding argument to be of type "pointer to unsigned int". You
passed the wrong type, and invoked undefined behavior.
The scanf and printf families of functions don't provide reasonable
type-checking, and are horribly error-prone and very dangerous to use.
That's why C++ provides better alternatives in the form of stream classes.
Anything that puts the burden of type-checking on the programmer should
be avoided. Such things should be used only when absolutely necessary,
and then only with great caution by someone who know what they are doing.
Boost also provides a type-safe library for printf()-like formatting: http://www.boost.org/libs/format/index.html
Although it does not appear to provide anything scanf()-like.
-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.
John Phung wrote: Is there a fscanf equivalent for c++? Here's what I'm talking about:
The equivalent of fscanf() in C++ is fscanf(). But don't use it.
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
And here's why you shouldn't use it. If you used this code, your program
would be severely broken. The %x format specifier expects the
corresponding argument to be of type "pointer to unsigned int". You
passed the wrong type, and invoked undefined behavior.
The scanf and printf families of functions don't provide reasonable
type-checking, and are horribly error-prone and very dangerous to use.
That's why C++ provides better alternatives in the form of stream classes.
Anything that puts the burden of type-checking on the programmer should
be avoided. Such things should be used only when absolutely necessary,
and then only with great caution by someone who know what they are doing.
Boost also provides a type-safe library for printf()-like formatting: http://www.boost.org/libs/format/index.html
Although it does not appear to provide anything scanf()-like.
-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.
"Rolf Magnus" <ra******@t-online.de> wrote in message
news:c4******** *****@news.t-online.com... John Phung wrote:
Is there a fscanf equivalent for c++?
There is fscanf. ;-)
Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
what about
fscanf(AddressF ile, "%i", next_address);
???
"Rolf Magnus" <ra******@t-online.de> wrote in message
news:c4******** *****@news.t-online.com... John Phung wrote:
Is there a fscanf equivalent for c++?
There is fscanf. ;-)
Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
what about
fscanf(AddressF ile, "%i", next_address);
???
Nick Hounsome wrote: "Rolf Magnus" <ra******@t-online.de> wrote in message
news:c4******** *****@news.t-online.com...
John Phung wrote:
Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
what about
fscanf(AddressF ile, "%i", next_address);
Undefined behavior. %i requires the corresponding argument to be of type
"pointer to (signed) int". You have provided an argument of type
"unsigned int".
As I said in my other reply in this thread:
The scanf and printf families of functions don't provide reasonable
type-checking, and are horribly error-prone and very dangerous to use.
That's why C++ provides better alternatives in the form of stream classes.
Anything that puts the burden of type-checking on the programmer should
be avoided. Such things should be used only when absolutely necessary,
and then only with great caution by someone who know what they are doing.
-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.
Nick Hounsome wrote: "Rolf Magnus" <ra******@t-online.de> wrote in message
news:c4******** *****@news.t-online.com...
John Phung wrote:
Here's what I'm talking about:
unsigned int NextAddress(ifs tream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
what about
fscanf(AddressF ile, "%i", next_address);
Undefined behavior. %i requires the corresponding argument to be of type
"pointer to (signed) int". You have provided an argument of type
"unsigned int".
As I said in my other reply in this thread:
The scanf and printf families of functions don't provide reasonable
type-checking, and are horribly error-prone and very dangerous to use.
That's why C++ provides better alternatives in the form of stream classes.
Anything that puts the burden of type-checking on the programmer should
be avoided. Such things should be used only when absolutely necessary,
and then only with great caution by someone who know what they are doing.
-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.
Nick Hounsome wrote: > -->How do I rewrite the fscanf listed below using ifstream?
^^^^^^^^^^^^^^
> -->fscanf(Address File, "%x", next_address);
AddressFile >> std::hex >> next_address;
what about
fscanf(AddressF ile, "%i", next_address);
???
The OP wanted to use an ifstream. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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last post by:
Is there a fscanf equivalent for c++? Here's what I'm talking about:
unsigned int NextAddress(ifstream& AddressFile) {
unsigned int next_address;
-->How do I rewrite the fscanf listed below using ifstream?
-->fscanf(AddressFile, "%x", next_address);
if(AddressFile.eof()) {
return 0;
|
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