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From "Jeremy Dean" <d...@roguewave.com>
Subject Getting incorrect behavior on strstream
Date Fri, 22 Jun 2007 20:44:46 GMT
I have a testcase that is showing incorrect behavior ostrstream or
ostringstream:
 
#include <cstdio>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <strstream>
#include <cmath>
 
void test1() {
    std::ostringstream S;
    long double x = std::pow(1e300,2);
    S << "Something " <<  std::setprecision(8) << x;
    S << " else";
    std::printf("Test1: %s\n", S.str().c_str());
}
void test2() {
    std::ostrstream S;
    long double x = std::pow(1e300,2);
    S << "Something " << std::setprecision(7) << x;
    S << " else";
    std::printf("Test2: %s\n", S.str());
}
void test3() {
    std::ostrstream S;
    long double x = 0.0/0.0;
    S << "Something " << std::setprecision(8) << x;
    S << " else";
    std::printf("Test3: %s\n", S.str());
}
int main(int argc, char* argv[]) {
    test1();
    test2();
    test3();
}
 
 
On solaris 8 with Sun Studio 8 patch 14 I get the following output
 
Test1: Something inf
Test2: Something inf else else
Test3: Something nan else
 
Test1 is missing else
Test2 has an extra else
Test3 looks ok.
 
On RedHat 3u6 I get the following output:
 
Test1: Something inf else
Test2: Something inf else
Test3: Something nan elseing inf else
 
Test1 and 2 look ok
Test3 however has extra output "ing inf else"
 
Any thoughts on this problem?
 
Thanks,
 
Jeremy
 
Jeremy Dean 
Rogue Wave Software,
A QUOVADX(tm) division 
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