Steps are as follows:
Download gcc v6.1.0 32-bit from
ftp://ftp.equation.com/gcc/gcc-6.1.0-32.exe
Filename: gcc-6.1.0-32.exe
Install gcc 32-bit to "C:\gcc-6.1.0-32"
Please log off and log in again to configure the gcc for all users on this operating system.
Download and install Notepad++ from
https://notepad-plus-plus.org/download/
Open Notepad++
Save the new file as "cpp2017_eg1.cpp"
Filename: cpp2017_eg1.cpp
File content:
/********************/
#define __STDCPP_WANT_MATH_SPEC_FUNCS__ 1 //betaf(), beta()
#include <iostream>
#include <string>
#include <experimental/string_view>
#include <cmath>
using namespace std;
int main()
{
cout << __cplusplus << endl; //201500
//Hexadecimal literals
int hex1 = 0xA;
cout << hex1 << endl; //10
experimental::string_view v = "hello world";
v = v.substr(7);
cout << v << endl; //orld
//Mathematical special functions from C++ 2017
cout << betaf(4.0f, 2.0f) << endl; //0.05
int n = 4;
int k = 2;
cout << 1/( (n+1)*beta(n-k+1, k+1) ) << endl; //6
// C(4,2)=4!/(2!2!)=4x3/2=6
cout << expint(1) << endl; //1.89512, exponential integral
cout << riemann_zeta(2) << endl; //1.64493
return 0;
}
/********************/
Program output: Open command prompt window
C:\my_folder_path> g++ --version
g++ (GCC) 6.1.0
C:\my_folder_path> g++ -std=c++17 cpp2017_eg1.cpp -o a.exe
C:\my_folder_path> a.exe
201500
10
orld
0.05
6
1.89512
1.64493
Step to uninstall GCC downloaded from
http://www.equation.com/servlet/equation.cmd?fa=fortran
* Open the system “Environment Variables” frame
* Delete the system variable named “EQ_LIBRARY_PATH” which contains the following variable value "C:\gcc-6.1.0-32\i686-pc-mingw32\lib"
* Delete the following two system path values from the system variable named “Path”:
*** "C:\gcc-6.1.0-32\bin;”
*** “C:\gcc-6.1.0-32\libexec\gcc\i686-pc-mingw32\6.1.0;"
* Delete the directory at “C:\gcc-6.1.0-32”
Reading. Practice. Writing.
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Tuesday
Friday
Qt C++: Solution for “error: variable 'QPointer label' has initializer but incomplete type”
Qt C++: Solution for “error: variable 'QPointer<QLabel> label' has initializer but incomplete type”
C++ Code with Error message:
You need to include the “#include <QPointer>“ at the top section in this implementation file.
C++ Code with Error message:
void MainWindow::on_pushButton_clicked()
{
QPointer<QLabel> label = ui->label1;
label->setText("Label 1 text changed");
}
Solution:
You need to include the “#include <QPointer>“ at the top section in this implementation file.
Qt C++: Solution for “error: only constructors take member initializers” and “warning: no return statement in function returning non-void [-Wreturn-type]”
Qt C++: Solution for “error: only constructors take member initializers” and “warning: no return statement in function returning non-void [-Wreturn-type]”
C++ Code with Error and Warning messages:
C++ Code with Error and Warning messages:
class ClassName
{
private:
QString s;
double d;
public:
ClassKName(QString s="noName", double d=0.0) : s(s), d(d)
{
}
};
Solution:
The constructor name is different from the class name.
Rename the constructor name ClassKName to be the same with ClassName without the extra letter ‘K’.
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