CIN at QT (the clearest tutorial in the whole network)

One 、 Configuration work
To configure .pro file , stay CONFIG Add console, Pay attention to adding “ structure -> perform qmake” Otherwise, the configuration is invalid .

Two 、 Run settings , Check Run in terminal

3、 ... and 、mian.cpp Add header file to

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    
    double a,b;

    cin >> a >> b;
    cout << a << "\n";
    cout << b << "\n";
    cout << sqrt(b) << "\n";// take a square root 
    cout << "LZH";
    return 0;
}

Four 、 compile 、 Can run .