Error "QString::arg: Argument missing"

[Lawand]

When building and executing the following code:

#include <QString>
#include <iostream>

int main()
{
QString someString = QString("1%").arg("Hello World!");

std::cout << someString.toStdString();

return 0;
}

I get this output:

QString::arg: Argument missing: 1%, Hello World!
1%

which includes the error message "QString::arg: Argument missing", why am I getting this??

Thanks in advance.

[gruszczy]

It should be %1, not 1%.

[lni]

Change 1% -> %1

[Lawand]

Hello World!
Thanks gruszczy, the problem drove me crazy, but now it's solved :)