Imread change image display size

Pretty simple , But not , It's been checked for a long time , sad , Write to yourself

---

int main()
{
    
    Mat girl = imread("F:/VSMaven/LocateQr/Location/Location/phone.jpg", IMREAD_REDUCED_COLOR_2); // Load image to Mat
    if (girl.empty()) {
    
        printf(" No such picture , Please check that the path is correct ");
        return -1;
    }
    else {
    
        namedWindow("enhanced", 0);
        resizeWindow("enhanced", 300, 400);// What's shown is 300*400 Size , Drag and drop 
        imshow("enhanced", girl);// The display name is  "enhanced" The window of  
    }
    waitKey(0);
    return 0;

yes else The three sentences in , The size can be set by yourself