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#1
June 24th, 2003, 07:33 AM
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sig figs BCB
I know in console C++ iomanip and setprecision could be used to set the number of significant figures to be displayed. However, this was for use with the cout << operator. How would I make say, a double be rounded to 2 sig figs after the decimal? Is it possible to set the value inside the variable?
SomeFunction(double) = double Or is there another way of formatting numbers? As always, any help is appreciated. Thanks.
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#2
June 24th, 2003, 12:22 PM
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Something like this maybe:
Code:
#include <cmath>
#include <iomanip>
#include <iostream>
using namespace std;
double roundit(double val, int places) {
return (floor(val * pow(10, places) + 0.5) / pow(10, places));
}
int main(void) {
double foo = 123.456789;
double bar = roundit(foo, 2);
cout << setprecision(10) << foo << " " << bar << endl;
return 0;
}
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#3
June 24th, 2003, 12:35 PM
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You could still use streams (and iomanip) even if you're not doing a console application:
Code:
#include <sstream>
#include <string>
using namespace std;
.
.
.
__fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner)
{
ostringstream oss;
string sTest;
oss << "AGibel" << " Testing " << 123;
sTest = oss.str();
Edit1->Text = sTest.c_str();
}
CurrencyString = ""; // instead of "$" CurrencyFormat = 3; NegCurrFormat = 15; ThousandSeparator = ''; // instead of ',' DecimalSeparator = '.'; double dblValue = 1234.5678; Amount->Text = CurrToStrF(dblValue, ffNumber, 2); You also might want to look at the sprintf() method of an AnsiString. See page 3 and 4 of the attached document.
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