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Question! Converting String to a double or Integer where the value is rounded up or down?

Posted on 2006-07-24
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Last Modified: 2010-04-01
Hi guys,

My question is about how, when received a string& one can take that string and convert it to double,
alternatively I want the string to be converted into an integer rounded up or down ie value in from string is 1.560008 then the int = 2 etc.

Here's how I failed to convert the string& to double:

void getValue(string& theValue) {
      double d;
      char l [256];
      l = theValue;
      d = atof(theValue);
      cout << d << endl;
      cout << flush;
}

any inputs are welcomed

All the best
Idar
0
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Question by:Idarhillgaar
  • 2
3 Comments
 
LVL 7

Accepted Solution

by:
nafis_devlpr earned 250 total points
ID: 17166576
you can do it this way

 d = atof(theValue.c_str());

or

sscanf(theValue.c_str(), "%lf", &d);

for the second question, do the above then do this

int i= (int)(d+0.5);

hope this helps

Nafis
0
 
LVL 7

Expert Comment

by:nafis_devlpr
ID: 17166592
>> int i= (int)(d+0.5);

this will actually round the values, for example :

if 1.5 it will be 2
if 1.4 it will be 1

you can also use the ceil or floor to round-up or round-down the values, for exmple

if  1.5
then ceil(1.5) will give 2.0
and floor(1.5) will give 1.0


Nafis
0
 

Author Comment

by:Idarhillgaar
ID: 17166719
Fabulous answers - Have a good summer!

Cheers
Idar
0

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