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RemoteC2 · Nov 2nd, 2006, 10:32 PM

nothing too special, just an ascii character generator. just thought that it was kinda cool.

//generate ascii table
#include <iostream>
using namespace std;

int main()
{
    int num[255];
    char str[255];
    for(int i=0; i<255; i++)
    {
            num[i] = i;
            str[i] = (char) num[i];
    }
    for(int j=0; j<255; j++)
    {
            cout << str[j] << "-" << num[j] << endl;
    }
    system("pause");
}

Sane · Nov 2nd, 2006, 10:37 PM

Why do you use arrays? You can just print out the values according to 'i', instead of needlessly storing them in memory.

(Toggle Plain Text)

//generate ascii table
#include <iostream>
using namespace std;

int main()
{
    for(int i=0; i<255; i++)
    {
            cout << (char) i << "-" << i << endl;
    }
    system("pause");
}

Furthermore, if you do actually need it stored in memory, why do you have two different loops? You can output them while you assign them:

(Toggle Plain Text)

//generate ascii table
#include <iostream>
using namespace std;

int main()
{
    int num[255];
    char str[255];
    for(int i=0; i<255; i++)
    {
            num[i] = i;
            str[i] = (char) num[i];

            cout << str[i] << "-" << num[i] << endl;
    }
    system("pause");
}

RemoteC2 · Nov 3rd, 2006, 12:05 AM

i know that there are some problems in it, but it literally took me 5 minutes to program. just thought that it was cool.

RemoteC2 · Nov 3rd, 2006, 12:11 AM

not that anyone cares, but here is the revised version

(Toggle Plain Text)

//generate ascii table v1.2
#include <iostream>
using namespace std;

int main()
{
    int num;
    char str;
    for(int i=1; i<257; i++)
    {
            num = i;
            str = (char) num;
            cout << str << "-" << num << endl;
    }
    system("pause");
}

mrynit · Nov 3rd, 2006, 12:29 AM

again you are doing more than is needed.

(Toggle Plain Text)

num = i;//why do you need num?
str = (char) num;//num is i so you can just use i here
cout << str << "-" << num << endl;// use i here too

(Toggle Plain Text)

//generate ascii table v1.2
#include <iostream>
using namespace std;

int main()
{
    for(int i=1; i<257; i++)
    {
            cout << (char)i << "-" << i << endl;
    }
    system("pause");
}

lectricpharaoh · Nov 3rd, 2006, 12:32 AM

You shouldn't go from 1 to 256; rather, you probably intended to go from 0 to 255. I realize that, given an 8-bit char type (which is usually, but not universally, true), it will wrap back to zero, but that's not the point. Also, ASCII only defines 7-bit codes (the upper bit is zero), so ASCII is actually 0 to 127. That said, you'll probably want to skip codes below 32, as they are defined as control characters in ASCII encoding. Last, why do you use an int, and then cast it to char? You can count with a char, too (it's just an integer type with a (usually) smaller range).

Having said all that, you could try to beautify the layout by arranging the output in a table or grid of some kind. Then it would be easier to read.

DaWei · Nov 3rd, 2006, 12:40 AM

Quote:

given an 8-bit char type (which is usually, but not universally, true)

lectricpharaoh · Nov 3rd, 2006, 12:58 AM

I was under the impression the C and C++ standards did no define the exact sizes of the data types. For example, a system could have a 9-bit byte, which would likely mean a 9-bit char type as well, wouldn't it? Clickie.

DaWei · Nov 3rd, 2006, 2:12 AM

Just wanting to emphasize that while a byte MIGHT have 9 (or more) bits, a char is always ONE byte. The same is not true of an int, for example, which might vary in its byte length. Consequently, types are not necessarily brothers under the skin as regards their exactness.

Off that subject, and onto another, many new users might not have noticed that functions that ask for a char (one byte) often return an int. This is so that values representing an anomolous condition may be distinguished from a full suite of values that represent a char. If you want to have some fun, mess around with EOF.

Nov 2nd, 2006, 10:32 PM	#1
RemoteC2 Programmer Join Date: Jan 2006 Posts: 55 Rep Power: 3	ascii character generator nothing too special, just an ascii character generator. just thought that it was kinda cool. (Toggle Plain Text) //generate ascii table #include <iostream> using namespace std; int main() { int num[255]; char str[255]; for(int i=0; i<255; i++) { num[i] = i; str[i] = (char) num[i]; } for(int j=0; j<255; j++) { cout << str[j] << "-" << num[j] << endl; } system("pause"); } //generate ascii table #include <iostream> using namespace std; int main() { int num[255]; char str[255]; for(int i=0; i<255; i++) { num[i] = i; str[i] = (char) num[i]; } for(int j=0; j<255; j++) { cout << str[j] << "-" << num[j] << endl; } system("pause"); }

Nov 2nd, 2006, 10:37 PM	#2
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,076 Rep Power: 6	Why do you use arrays? You can just print out the values according to 'i', instead of needlessly storing them in memory. (Toggle Plain Text) //generate ascii table #include <iostream> using namespace std; int main() { for(int i=0; i<255; i++) { cout << (char) i << "-" << i << endl; } system("pause"); } //generate ascii table #include <iostream> using namespace std; int main() { for(int i=0; i<255; i++) { cout << (char) i << "-" << i << endl; } system("pause"); } Furthermore, if you do actually need it stored in memory, why do you have two different loops? You can output them while you assign them: (Toggle Plain Text) //generate ascii table #include <iostream> using namespace std; int main() { int num[255]; char str[255]; for(int i=0; i<255; i++) { num[i] = i; str[i] = (char) num[i]; cout << str[i] << "-" << num[i] << endl; } system("pause"); } //generate ascii table #include <iostream> using namespace std; int main() { int num[255]; char str[255]; for(int i=0; i<255; i++) { num[i] = i; str[i] = (char) num[i]; cout << str[i] << "-" << num[i] << endl; } system("pause"); }

Nov 3rd, 2006, 12:11 AM	#4
RemoteC2 Programmer Join Date: Jan 2006 Posts: 55 Rep Power: 3	not that anyone cares, but here is the revised version (Toggle Plain Text) //generate ascii table v1.2 #include <iostream> using namespace std; int main() { int num; char str; for(int i=1; i<257; i++) { num = i; str = (char) num; cout << str << "-" << num << endl; } system("pause"); } //generate ascii table v1.2 #include <iostream> using namespace std; int main() { int num; char str; for(int i=1; i<257; i++) { num = i; str = (char) num; cout << str << "-" << num << endl; } system("pause"); }

Nov 3rd, 2006, 12:29 AM	#5
mrynit Hobbyist Programmer Join Date: Mar 2006 Location: WA, USA Posts: 343 Rep Power: 3	again you are doing more than is needed. (Toggle Plain Text) num = i;//why do you need num? str = (char) num;//num is i so you can just use i here cout << str << "-" << num << endl;// use i here too num = i;//why do you need num? str = (char) num;//num is i so you can just use i here cout << str << "-" << num << endl;// use i here too (Toggle Plain Text) //generate ascii table v1.2 #include <iostream> using namespace std; int main() { for(int i=1; i<257; i++) { cout << (char)i << "-" << i << endl; } system("pause"); } //generate ascii table v1.2 #include <iostream> using namespace std; int main() { for(int i=1; i<257; i++) { cout << (char)i << "-" << i << endl; } system("pause"); } __________________ i dont know much about programming but i try to help

Nov 3rd, 2006, 12:32 AM	#6
lectricpharaoh SEXY SHOELESS GOD OF WAR! Join Date: Jun 2005 Location: Wet west coast of Canada Posts: 1,186 Rep Power: 5	You shouldn't go from 1 to 256; rather, you probably intended to go from 0 to 255. I realize that, given an 8-bit char type (which is usually, but not universally, true), it will wrap back to zero, but that's not the point. Also, ASCII only defines 7-bit codes (the upper bit is zero), so ASCII is actually 0 to 127. That said, you'll probably want to skip codes below 32, as they are defined as control characters in ASCII encoding. Last, why do you use an int, and then cast it to char? You can count with a char, too (it's just an integer type with a (usually) smaller range). Having said all that, you could try to beautify the layout by arranging the output in a table or grid of some kind. Then it would be easier to read. __________________ And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot. - Vaarsuvius, Order of the Stick

Nov 3rd, 2006, 12:05 AM	#3
RemoteC2 Programmer Join Date: Jan 2006 Posts: 55 Rep Power: 3	i know that there are some problems in it, but it literally took me 5 minutes to program. just thought that it was cool.

Nov 3rd, 2006, 12:58 AM	#8
lectricpharaoh SEXY SHOELESS GOD OF WAR! Join Date: Jun 2005 Location: Wet west coast of Canada Posts: 1,186 Rep Power: 5	I was under the impression the C and C++ standards did no define the exact sizes of the data types. For example, a system could have a 9-bit byte, which would likely mean a 9-bit char type as well, wouldn't it? Clickie. __________________ And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot. - Vaarsuvius, Order of the Stick

Nov 3rd, 2006, 2:12 AM	#9
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Just wanting to emphasize that while a byte MIGHT have 9 (or more) bits, a char is always ONE byte. The same is not true of an int, for example, which might vary in its byte length. Consequently, types are not necessarily brothers under the skin as regards their exactness. Off that subject, and onto another, many new users might not have noticed that functions that ask for a char (one byte) often return an int. This is so that values representing an anomolous condition may be distinguished from a full suite of values that represent a char. If you want to have some fun, mess around with EOF. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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