Odd Results in Application Output Pane on simple C++ app

[t4w2]

Running Qt Creator 2.7.0 Based on Qt 5.0.2 (32 bit).


1. Start Qt, File --> New File or Project --> Non-Qt Project --> Plain C++ Project --> Choose

Name: t1
Create in: E:\test\
Use as default project location: left unchecked

Hit Next.

2. Kit Selection

(checked) Desktop Qt 5.0.2 MinGw 32bit
(checked) E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug
(checked) E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Release

Hit Next.

3. Project Management

Add to version control: <None>

Hit Finish


4. Select "Projects" button --> Run tab --> Uncheck "Run in terminal"

5. Edit button. Update main.cpp to the following:

#include <iostream>
 
using namespace std;
 
int main()
{
    int i;
 
    for (i=1; i<52; i++)
    {
        cout << i << endl;
    }
    cout << endl;
    return 0;
}

#include <iostream>

using namespace std;

int main()
{
    int i;

    for (i=1; i<52; i++)
    {
        cout << i << endl;
    }
    cout << endl;
    return 0;
}

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t1.pro file is left to default values:

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
 
SOURCES += main.cpp

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

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6. Hit RUN (Ctrl+R)

Results (Application Output Pane):

Starting E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1...
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E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1 exited with code 0

Starting E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1...
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E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1 exited with code 0

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Hit RUN again (Ctrl+r)

Results (Application Output Pane):

Starting E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1...
1
E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1 exited with code 0

Starting E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1...
1
E:\test\build-t1-Desktop_Qt_5_0_2_MinGW_32bit-Debug\debug\t1 exited with code 0

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Hit DEBUG (F5)

Results (Application Output Pane):

Debugging starts
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Debugging has finished

Debugging starts
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Debugging has finished

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What the heck is going on here? Every time I run this with "RUN Ctrl+R" I get different results, but I get the expected (and reliable) results in DEBUG (F5)?

[aamer4yu]

Not sure what machine you are running it on.

Its showing proper result with printing till 51 on my machine.. Tried under release and debug builds both.

[t4w2]

Windows 7 64bit with Intel Xeon E5410.

As in step 2 above, though I compiled with "Desktop Qt 5.0.2 MinGw 32bit."

[t4w2]

If I change the code slightly, this appears to work. I'm not sure why, but there must be some kind of glitch with flushing cout on std::endl in Qt Application Panel.

#include <iostream>
 
using namespace std;
 
int main()
{
    int i;
 
    for (i=1; i<52; i++)
    {
        cout << i << "\n";
    }
    cout << endl;
    return 0;
}

#include <iostream>

using namespace std;

int main()
{
    int i;

    for (i=1; i<52; i++)
    {
        cout << i << "\n";
    }
    cout << endl;
    return 0;
}

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