while statement exercise help

[Aesthetics]

Hello,

I need some help resolving a few exercises for the while statement. Below is the original code:

#include <iostream>
int main()
{
	int sum = 0, val = 1;
	
	while (val <= 10) {
		sum += val; 
		++val; 
	}
	std::cout << "Sum of 1 to 10 inclusive is "
		<< sum << std::endl;
	return 0;
}

Output:

Sum of 1 to 10 inclusive is 55

Now, I have to do these exercises:

Exercise 1.9: Write a program that uses a while to sum the numbers from
50 to 100.
Exercise 1.10: In addition to the ++ operator that adds 1 to its operand,
there is a decrement operator (--) that subtracts 1. Use the decrement
operator to write a while that prints the numbers from ten down to zero.
Exercise 1.11: Write a program that prompts the user for two integers.
Print each number in the range specified by those two integers.

Can somebody help me resolve them all? I know that the while statement keeps a repeating something until it's false. I also have no idea how the program outputs 55.
Help is really appreciated!

[tree]

1.9 should be easy, just initialize val to 50 and change the while to go to 100

1.10 is the same as the example, just initialize val to 10, decrement it in the loop and change the while to run while val>=0

1.11 just get input from the user, set them to num1 and num2.

while (num1!=num2) {
     sum+=num1;
     num1++;
}

assuming num2 is the larger int

[Aesthetics]

Thank you for your fast response my friend, can you write everything in code? I started C++ yesterday, and the while statement is just so hard for me to understand, I have no idea why.

[tree]

Basic while function:

int start=0; // the low end of the range
int end=10; // high end of the range

while (start<end) {
     // do whatever operation: adding, outputting, calling functions, etc
     start++ /*increment the control variable.  without this, the loop will
                  run forever.*/
}

So: 1.9 will require that start will equal 50, and end will equal 100. Or instead of using a variable (as in while (start<end)), you can just use the actual number (start<100). Inside this loop just add start to sum and increment start.

1.10 is very similar, except instead while (start<someNumber), start already is greater than the termination value, so you use while (start>someNumber) and instead of adding numbers inside the loop, just cout<<start, so each number start get assigned to will be output.

1.11 is slightly more complicated so here goes:

int num1, num2;
cout << "Enter two numbers: ";
cin >> num1 >> num2;

while (num1<=num2) {
     cout << num1 << endl;
     num1++;
}

Hope this helps!

[Aesthetics]

Thank you so much!
Really helped me, C++ is a hard language, but I'm learning very well, and you helped me to continue in my book, thanks!