errors

compiling opencv_webcam.cpp
opencv_webcam.cpp: In function ‘int main()’:
opencv_webcam.cpp:8:9: error: ‘cap’ was not declared in this scope
opencv_webcam.cpp:11:9: error: ‘k’ was not declared in this scope
opencv_webcam.cpp:11:23: error: ‘waitkey’ was not declared in this scope
opencv_webcam.cpp:12:9: error: expected ‘;’ before ‘if’
Output file => opencv_webcam

errors!

compiling opencv_webcam.cpp
opencv_webcam.cpp: In function ‘int main()’:
opencv_webcam.cpp:8:9: error: ‘cap’ was not declared in this scope
opencv_webcam.cpp:11:9: error: ‘k’ was not declared in this scope
opencv_webcam.cpp:11:23: error: ‘waitkey’ was not declared in this scope
opencv_webcam.cpp:12:9: error: expected ‘;’ before ‘if’
Output file => opencv_webcam

webcam.cpp

#include<opencv2/highgui/highgui.hpp>
using namespace cv;

int main()
{
    while(1)
    {
        cap = VideoCapture(0);
        Mat img = cap.read();
        imshow("image",img);
        k = waitkey(10)
        if k == 27:
        break;
    }
    return 0;
}

webcam1.cpp

#include<opencv2/highgui/highgui.hpp>
using namespace cv;

int main()
{
    int k;
    VideoCapture cap = VideoCapture(0);
    while(1)
    {
        Mat img;
        cap >> img;
        imshow("image",img);
        k = waitKey(10);
        if (k == 27)
        {
            break;
        }
    }
    return 0;
}
//This works perfectly well