64-bit Terminal?

Question

64-bit Terminal?

Hi, I need to work with 64-bit data on the terminal (C++ long double test output), but it happens to be a 32-bit app, how can i change my terminal, if possible, from a 32-bit app to a 64-bit? (I know that it would probably make it slower, but I just need that way).
Thanks

MacBook 2.4GHz, Mac OS X (10.5.6)

Posted on Jan 31, 2009 12:08 AM

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Answer 1

orangekay

Level 5

4,085 points

Jan 31, 2009 3:36 AM in response to Sergio Botero

1. You can't.

2. Terminals deal with characters, not numbers.

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Answer 2

Jan 31, 2009 4:34 AM in response to Sergio Botero

Terminal provides a gateway to the Unix layer, the heart of the operating system. Leopard is a 64-bit operating system which means that the programs you run using terminal (located, for example, in /bin and /sbin) take advantage of Leopard's 64-bit features if they have been compiled to do so.

I don't know how to check if a particular binary is 32- or 64-bit, but having a 64-bit Terminal won't change how you interact with the Unix layer unless you want to copy more than 4GB of text from one window to the next! ; )

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Answer 3

BobHarris

Level 9

56,939 points

Jan 31, 2009 6:19 AM in response to Sergio Botero

This is a programming problem. It has nothing to do with the terminal.

Have you tried


printf("%Lf ",longDblVar);

It might be best to take this to the *Software Development 101* forum under Mac OS Technologies, or at least post some code for us to look at. Wrap any code posted in

...

and it will display nicely in the forums.

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Answer 4

Jan 31, 2009 8:25 AM in response to BobHarris

Again, Thank you BobHarris, that did it, you are right and it was a problem in the code, to be honest i didn't even knew that you could use "%Lf" instead "%llf" which was my former choice and seemed to work on linux. this is the simple code i was using.


#include <cstdio>
#include <cmath>
int main () {
 long double n,p,k;
 for( ;scanf("%Lf%Lf",&n,&p)==2; ){
 k=pow(10,log10(p)/n);
 printf("%.0Lf   ",k);
 }
 return 0;
}

Thank you again. (also for the {code} format tip)

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Answer 5

BobHarris

Level 9

56,939 points

Jan 31, 2009 8:58 AM in response to BobHarris

Here is a coding example:


#include <stdio.h>
main()
{
 long double longDblVar = 3.141592653589793238462643383279502884197169399375105820974944L;
 long double longDblSscanf;
 printf(" ");
 printf("fprintf() example: ");
 printf("%25.20La ", longDblVar);
 printf("%25.20LA ", longDblVar);
 printf("%25.20Le ", longDblVar);
 printf("%25.20LE ", longDblVar);
 printf("%25.20Lf ", longDblVar);
 printf("%25.20LF ", longDblVar);
 printf("%25.20Lg ", longDblVar);
 printf("%25.20LG ", longDblVar);
 printf(" ");
 printf("sscanf() example: ");
 sscanf("3.141592653589793238462643383279502884197169399375105820974944",
 "%Lf", &longDblSscanf);
 printf("%25.20La ", longDblSscanf);
 printf("%25.20LA ", longDblSscanf);
 printf("%25.20Le ", longDblSscanf);
 printf("%25.20LE ", longDblSscanf);
 printf("%25.20Lf ", longDblSscanf);
 printf("%25.20LF ", longDblSscanf);
 printf("%25.20Lg ", longDblSscanf);
 printf("%25.20LG ", longDblSscanf);
 printf(" ");
}

I compiled it using:


cc longDblExample.c -o longDblExample

And here is the output I get from this example code:


$ longDblExample
fprintf() example:
0xc.90fdaa22168c23500000p-2
0XC.90FDAA22168C23500000P-2
3.14159265358979323851e+00
3.14159265358979323851E+00
 3.14159265358979323851
 3.14159265358979323851
 3.1415926535897932385
 3.1415926535897932385
sscanf() example:
0xc.90fdaa22168c23500000p-2
0XC.90FDAA22168C23500000P-2
3.14159265358979323851e+00
3.14159265358979323851E+00
 3.14159265358979323851
 3.14159265358979323851
 3.1415926535897932385
 3.1415926535897932385

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Answer 6

BobHarris

Level 9

56,939 points

Jan 31, 2009 9:00 AM in response to BobHarris

I had to go shovel some snow between starting my example and posting it. I didn't go back and check to see if there were additional posts, so I did not see your example code before I posted. Sorry.

You sould be able to get information about the support printf() formats using


man 3 printf

Although it is the kind of man page that requires reading, re-reading, reading again, and all along the way you need to try examples.

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