Write a loop that reads positive integers from standard input and that terminates when it reads an integer that is not positive. after the loop terminates

while(x>=0)

{

     loop execution that manipulates x

}

Explanation:

A while loop keep iterating as long as the condition inside is true. The necessary element to remember is to make your the condition variable is altered from within the loop. Otherwise, the loop will become an infinite loop.

The condition state that as long as the variable x is greater than or equal to 0, the loop will continue. If x becomes negative, the loop will terminate.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.