Question

CvMat* nextimg = 0;
int firstframe;


firstframe=nextimg==0;

if I don’t put “==0” returns the following warning:

[Warning] assignment makes integer from pointer without a cast

Answer 1

Its a shortened equivalent of

int firstframe;
if (nextimg == 0) {
    firstframe = 1;
}
else {
    firstframe = 0;
}