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TL
Joined: 15 Sep 2003
Posts: 75
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| Long integer to string |
 Posted: Fri Feb 03, 2006 5:31 am |
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I would like to convert a long integer v=2345 into a string called str=“2.345”.
I know how to strip v into single digits like integers v[0]=2, v[1]=3, v[2]=4, v[3]=5 by using division and modulus operators.
Could someone please tell me how I can convert the above v[] array of integers into str=”2.345”
I prefer a small function as opposed to standard library functions to save ROM space. |
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Benjamin
Joined: 11 Jan 2006
Posts: 21
Location: Quebec (Canada)
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| Posted: Fri Feb 03, 2006 9:12 am |
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Well the easy way would have been using sprintf:
| Code: |
sprintf(string,"%lu",long);
// or in your case
sprintf(str,"%f",v/1000);
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But if you really want to do this manually:
you have:
v[0]=2, v[1]=3, v[2]=4, v[3]=5
Since a string is in ASCII format (you can find the ASCII table on the internet), you want this:
str[0] = 50, str[1] = '.', str[2] = 51, str[3] = 52, str[4] = 53
All you have to do is add 48 to an interger to get the ASCII code.
You should try both methods to see if this really takes up less ROM. |
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Benjamin
Joined: 11 Jan 2006
Posts: 21
Location: Quebec (Canada)
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| Posted: Fri Feb 03, 2006 9:15 am |
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| P.S. D'ont forget that a string should normally finish with a NUL caracter (0), so str[5] = 0. This might depend on how you will use the string. Also make sure your table is large enough to receive this extra caracter. |
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TL
Joined: 15 Sep 2003
Posts: 75
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| Posted: Fri Feb 03, 2006 2:55 pm |
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| Thanks Benjamin for your help. I'll try your suggestions. |
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