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Reading numbers form a CString and adding them

Posted on 2004-11-10
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Last Modified: 2013-11-20
I have a CString, say:

CString testString = "abc123";

I want to add the 123, add convert the new number to a string.

I don't need to search the string as I know the positons of the digits I want to add (in this case positions 3,4, and 5..... 0 based)

thanks for any help!
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Question by:galneweinhaw
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4 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 12547836
You could use

int n = 123;
CString testString = "abc";
CString numString = testString.Right(testString.Length() - 3); // get a string onlys containing the numbers
testString = testString.Left(3); // cut off the old numbers

int tmp = atoi((LPCTSTR)numString);

numString.Format("%d", n + tmp);

testString = testString + numString; // put the parts together again
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Author Comment

by:galneweinhaw
ID: 12548023
Thanks, but I don't think I was very clear on what I need to do, I'll try to clarify:

I have a CString "@@@@12@@@"  where 1 and 2 are the two numbers I want to add and @ may be #'s or letters.

I want to do 1 + 2 = 3

then convert the 3 to a CString.

the numbers will always be single digit (0-9)

thanks again.

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Accepted Solution

by:
jkr earned 2000 total points
ID: 12548066
Aaah, OK, then it is

CString testString = "abc123";
CString strNum;
int n1 = testString[3] - '0'; // subtracting ASCII '0' will give the numeric value
int n2 = testString[4] - '0';

strNum.Format("%d", n1 + n2);

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Author Comment

by:galneweinhaw
ID: 12548214
thanks!
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