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Formatting strings to display correctly

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jag0666

jag0666

Programmer
Nov 17, 2003
2
US
Okay, here is my problem.

I need to display a report, but I have to use a vector of strings to do this. It was suggested to me to convert the strings to a char array to do the formatting and then convert back to strings. Here's an example of what I have to do....

Number of points: 20 SD: 8.733
Mean: 46.112 UCL: 72.987
LCL: 19.986

Where each line of that section would be a string. I'm not sure how I can get each field to line up correctly like that. I'm fairly new with programming in C++, so maybe it's just my lack of knowledge in the language that is giving me problems.

Anyone have any suggestions?

thanks!
Ben
 
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Use sprintf().

say for
Number of points: 20 SD: 8.733

say you have
int NumPoints = 20;
float SD = 8.733;
char outStr[100];

sprintf(outStr,"Number of points: %d \t\t SD: %f\n",
NumPoints , SD );

hope this helps

 
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I don't understand, which source data you have: (unformatted?) strings or native values (ints, doubles etc)?
1st case: you must parse column values before format its again. It's not so easy and not so hard task...
2nd case: use string based streams to format, why sprintf here?
Somewhat exotic know-how (freeware;): try generate html file to format your data in (pro;) table format report! You need only <table borders=0>, <tr> and <td> tags (plus <html>, <head>, <body>, of course). Then print its off-line via browser...
 
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Thanks for the replies.

What I need to do is format the lines as strings. For instance,

Number of points: 20 SD: 8.733

Would be one string in a vector of strings.
 
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You can use ostringstream for this.

#include <sstream>
#include <iostream>
#include <vector>

using namespace std;

int main(void)
{
ostringstream stream;
stream<<&quot;Number of points: &quot;<<20<<&quot;\t&quot;<<&quot;SD:&quot;<<8.733;
string str(stream.str());
cout<<str<<endl;
return 0;
}

Sean McEligot
 
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