#include <stdio.h>

int main(void)
{
    int x ; //This is the variable for being evaluated

    do
    {
    printf("Imput a figure between 1 y 8: ");
    scanf("%i", &x);

    }
    while ( x < 1 ||  x > 8 ); //This is a do...while statement.
                               //It repeats until x is between 1 AND 8

    { //this brace is not needed and might make you believe there is a while loop
        printf("Your imput was ::: %d ",x);
        printf("\n");

     } //closing brace that should also be removed
        printf("\n");

}

How does logical OR work?

int first(int x) {
    puts("first");
    return x;
}

int second(int x) {
    puts("second");
    return x;
}

void test(int x) {

    if (first(x) || second(x)) {
        puts("logical or returns true");
    }
    else {
        puts("logical or returns false");
    }
}

second
logical or returns false

logical or returns true

How does the looping code work?

{
    printf("Imput a figure between 1 y 8: ");
    scanf("%i", &x);
}
while ( x < 1 ||  x > 8 );  // Why this expression write in this way determinate the range???

Member 14968771 wrote:

I think I need to read-up on "friend" - that semms to be the real OOP ticket

Member 14968771 wrote:

I guess height and width are QRect public variables derived from "private" data.

Member 14968771 wrote:

In the mean time I'll looking at usage of "friend".

&MainWindow::Run_DDD_OPTION(testWidget)

Run_DDD_OPTION(testWidget); // runs fine

addAction(tr("&Device Discovery Dialog(modified Bluetooth scanner)"),
   this,
   MainWindow::Run_DDD_OPTION
   );