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Kipodimkozim
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 Posted: Thu Dec 18, 2008 1:38 pm Post subject: [Question] Converting hex/dec values with C++ |
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Hey guys,
I'm learning C++ with the help of "Learning C++" book by Tom Swan but using Miscrosof Visual C++ as a compiler instead of the Zortech one which came with the book..
I tired compiling this code but got an error (C2664 - cannot convert parameter 1 from 'long' to 'class ios &' A reference that is not to 'const' cannot be bound to a non-lvalue).
What am I doing wrong? o.O
| Code: | #include <iostream.h>
#include <stdlib.h>
#include <string.h>
void main()
{
long value;
char s[80];
cout<<"Value?";
cout<<'\n';
cin>>s;
value = atol(s);
cout<<"Decimal =" <<dec(value)
<<"Hexadecimal =" <<hex(value)
<<"Octal =" <<oct(value)<<'\n';
} |
EDIT: The error is regarding the last 3 lines..
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Last edited by Kipodimkozim on Thu Dec 18, 2008 4:33 pm; edited 1 time in total |
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nog_lorp
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| Posted: Thu Dec 18, 2008 1:46 pm Post subject: |
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What line was the error on? We need to see the code for dec, hex, oct.
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killersamurai
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| Posted: Thu Dec 18, 2008 2:11 pm Post subject: |
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Problems:
*using dec, hex, and oct wrong
*forgetting to append std:: or using
*Visual c++ doesn't take iostream.h, just iostream
| Code: |
#include <iostream>
#include <stdlib.h>
int main(void)
{
long value;
char s[80] = { 0 };
std::cout << "Value?\n";
std::cin >> s;
value = atol(s);
std::cout << "Decimal = " << value << std::endl;
std::cout << "Hexadecimal = "<< std::hex << value << std::endl;
std::cout << "Octal = " << std::oct << value << std::endl;
return 0;
}
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blackmorpheus
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| Posted: Thu Dec 18, 2008 2:36 pm Post subject: |
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| Cool tnx. I didnt know windows had these functions ( i/o library) !
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Kipodimkozim
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| Posted: Thu Dec 18, 2008 4:29 pm Post subject: |
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| killersamurai wrote: | Problems:
*using dec, hex, and oct wrong
*forgetting to append std:: or using
*Visual c++ doesn't take iostream.h, just iostream
| Code: |
#include <iostream>
#include <stdlib.h>
int main(void)
{
long value;
char s[80] = { 0 };
std::cout << "Value?\n";
std::cin >> s;
value = atol(s);
std::cout << "Decimal = " << value << std::endl;
std::cout << "Hexadecimal = "<< std::hex << value << std::endl;
std::cout << "Octal = " << std::oct << value << std::endl;
return 0;
}
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What's wrong with the oct, hex and dex? I'm using an older version of the book and he wrote the code the same way I did and it worked for him..
EDIT: I tried compiling it the way you wrote it and now I get - error C2653: 'std' : is not a class or namespace name (10 errors for each time std shows in the code).
| nog_lorp wrote: | | What line was the error on? We need to see the code for dec, hex, oct. |
What do u mean the code? at the book I'm learning from he compiled that cxact code with adding anything (with zortech comipler tho).
_________________
My smexy priest soon to be bishop:
[ ] Lvl 70
[ ] Lvl 100
[X] Lvl 120
[x] Genesis
[x] Zhelm
[ ] HT Pendant
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Learning C++
Last edited by Kipodimkozim on Thu Dec 18, 2008 4:48 pm; edited 1 time in total |
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Bizarro
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| Posted: Thu Dec 18, 2008 4:37 pm Post subject: |
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cuz u forgot to include use namespace std
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Kipodimkozim
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| Posted: Thu Dec 18, 2008 4:54 pm Post subject: |
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| Bizarro wrote: | | cuz u forgot to include use namespace std |
Will I have to write 10 different names for each std (namespace first, second and such..) or will writting "using namespace std;" at the begining be enough?
Ugh I hate that stupid book I should've bought a different one..
_________________
My smexy priest soon to be bishop:
[ ] Lvl 70
[ ] Lvl 100
[X] Lvl 120
[x] Genesis
[x] Zhelm
[ ] HT Pendant
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Learning C++ |
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Spawnfestis
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| Posted: Thu Dec 18, 2008 5:02 pm Post subject: |
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| Kipodimkozim wrote: | | Bizarro wrote: | | cuz u forgot to include use namespace std |
Will I have to write 10 different names for each std (namespace first, second and such..) or will writting "using namespace std;" at the begining be enough?
Ugh I hate that stupid book I should've bought a different one.. |
That's enough, what it does is basically cuts out the STANDARD:: (std::) out of the keywords.
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