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cout doesn't print to console

asked 2018-05-18 14:21:40 -0500

raisa_ gravatar image

I'm working with OpenCV and C++. Have set up my project correctly, testing it by calling and displaying image, it succeed. Now I'm following simple basic tutorial for beginner and my code won't show up.

Here's the code

#include <iostream>
#include "opencv2\opencv.hpp"

using namespace std;
using namespace cv;

double square(double x) {
    return x*x;   }

void print_square(double x) {
    cout<<"Square of "<< x <<"is "<<square(x)<<endl; }

int main (int argv, char** arc) {
    print_square(2);
    waitKey(0);
}

I have also carefully set my project as Console project, still nothing show on the console. There's no error as well. Any advice ?

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answered 2018-05-19 01:45:01 -0500

berak gravatar image

updated 2018-05-19 01:45:57 -0500

Square of 2is 4

can it simply be, that you're running this from VS, and the console window closes, before you can see the output ?

btw, note, that waitKey() only has an effect, if there's a highgui window. without that, try a

int k;
cin >> k;

instead. (or run your exe from a cmdline, not your IDE)

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Comments

Hi, thanks! Yes the window closes before I see any output. Also in this case, I don't need the user to input the number using cin. I'm just trying to call the method.

raisa_ gravatar imageraisa_ ( 2018-05-20 07:58:11 -0500 )edit

system("pause"); will also block nicely ;)

also, the problem will go away, once you start working with images, webcam, imshow() and such.

berak gravatar imageberak ( 2018-05-20 08:13:03 -0500 )edit

this one works !! thanks a lot !

raisa_ gravatar imageraisa_ ( 2018-05-20 08:14:51 -0500 )edit
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Asked: 2018-05-18 14:21:40 -0500

Seen: 128 times

Last updated: May 18 '18