# Count all x divisible number in a range

The problem at hand is to count the numbers within a given range that are divisible by a specific number 'x'. The task is to write a program that takes a starting number, an ending number, and a divisor 'x' as input, and then calculates and outputs the count of numbers within that range that are divisible by 'x'.

## Problem Statement

Given a range defined by a starting number 'start' and an ending number 'last', along with a divisor 'x', the goal is to count the numbers within the range [start, last] that are divisible by 'x'. The program should then print the list of such numbers and also display the count of such numbers.

## Example

Let's take the first test case from the provided code: `x = 4`

, `start = 2`

, and
`last = 38`

. The numbers divisible by 4 in the range [2, 38] are 4, 8, 12, 16, 20, 24, 28, 32, and 36.
There are a total of 9 numbers that fulfill this condition. The output from the program confirms this by listing the
divisible numbers and displaying the result as 9.

## Idea to Solve the Problem

To solve this problem, we can iterate through the range of numbers from 'start' to 'last' and check whether each number is divisible by 'x'. If it is divisible, we increment a counter and also store the divisible number in a list. At the end of the iteration, we print the list of divisible numbers and the counter.

## Pseudocode

Here is a standard pseudocode representation of the algorithm:

```
count_divisible(start, last, x):
if start > last:
swap start and last
num = start
counter = 0
divisible_numbers = empty list
while num <= last:
if num % x == 0:
add num to divisible_numbers
increment counter
increment num by x (if counter > 0) or by 1
print "Divisible by", x, "in range of [", start, "-", last, "] are :", divisible_numbers
print "Result:", counter
```

## Algorithm Explanation

- If the starting number is greater than the ending number, we swap their values to ensure 'start' is always less than or equal to 'last'.
- Initialize 'num' with 'start', 'counter' with 0, and 'divisible_numbers' as an empty list.
- Enter a loop that iterates while 'num' is less than or equal to 'last'.
- Check if 'num' is divisible by 'x'. If true, add 'num' to the 'divisible_numbers' list and increment 'counter'.
- Depending on whether 'counter' is greater than 0 or not, either increment 'num' by 'x' or by 1.
- After the loop, print the list of divisible numbers and the calculated counter.

## Code Solution

```
// C program
// Count all x divisible number in a range
#include <stdio.h>
// Count the divisible number in the given range
void count_divisible(int start, int last, int x)
{
if (start > last)
{
//Change sequence
count_divisible(last, start, x);
return;
}
else
{
int num = start;
int counter = 0;
printf("\n Divisible by %d in range of [%d-%d] are : [", x, start, last);
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
printf(" %d ", num);
//When get divisible number then increase counter value
counter++;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num++;
}
}
// Display calculated result
printf("]\n Result : %d\n", counter);
}
}
int main()
{
//Test case
int x = 4;
count_divisible(2, 38, x);
x = 3;
count_divisible(1, 10, x);
x = 13;
count_divisible(21, 33, x);
x = 7;
count_divisible(7, 29, x);
x = 2;
count_divisible(0, 0, x);
x = 6;
count_divisible(50, 120, x);
return 0;
}
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
/*
Java program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
// Count the divisible number in the given range
public void count_divisible(int start, int last, int x)
{
if (start > last)
{
//Change sequence
count_divisible(last, start, x);
return;
}
else
{
int num = start;
int counter = 0;
System.out.print("\n Divisible by " + x + " in range of [" + start + "-" + last + "] are : [");
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
System.out.print(" " + num + " ");
//When get divisible number then increase counter value
counter++;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num++;
}
}
// Display calculated result
System.out.print("]\n Result : " + counter + "\n");
}
}
public static void main(String[] args)
{
DivisibleNumbers obj = new DivisibleNumbers();
//Test case
int x = 4;
obj.count_divisible(2, 38, x);
x = 3;
obj.count_divisible(1, 10, x);
x = 13;
obj.count_divisible(21, 33, x);
x = 7;
obj.count_divisible(7, 29, x);
x = 2;
obj.count_divisible(0, 0, x);
x = 6;
obj.count_divisible(50, 120, x);
}
}
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
//Include header file
#include <iostream>
using namespace std;
/*
C++ program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
public:
// Count the divisible number in the given range
void count_divisible(int start, int last, int x)
{
if (start > last)
{
//Change sequence
this->count_divisible(last, start, x);
return;
}
else
{
int num = start;
int counter = 0;
cout << "\n Divisible by " << x << " in range of [" << start << "-" << last << "] are : [";
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
cout << " " << num << " ";
//When get divisible number then increase counter value
counter++;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num++;
}
}
// Display calculated result
cout << "]\n Result : " << counter << "\n";
}
}
};
int main()
{
DivisibleNumbers obj = DivisibleNumbers();
//Test case
int x = 4;
obj.count_divisible(2, 38, x);
x = 3;
obj.count_divisible(1, 10, x);
x = 13;
obj.count_divisible(21, 33, x);
x = 7;
obj.count_divisible(7, 29, x);
x = 2;
obj.count_divisible(0, 0, x);
x = 6;
obj.count_divisible(50, 120, x);
return 0;
}
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
//Include namespace system
using System;
/*
C# program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
// Count the divisible number in the given range
public void count_divisible(int start, int last, int x)
{
if (start > last)
{
//Change sequence
count_divisible(last, start, x);
return;
}
else
{
int num = start;
int counter = 0;
Console.Write("\n Divisible by " + x + " in range of [" + start + "-" + last + "] are : [");
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
Console.Write(" " + num + " ");
//When get divisible number then increase counter value
counter++;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num++;
}
}
// Display calculated result
Console.Write("]\n Result : " + counter + "\n");
}
}
public static void Main(String[] args)
{
DivisibleNumbers obj = new DivisibleNumbers();
//Test case
int x = 4;
obj.count_divisible(2, 38, x);
x = 3;
obj.count_divisible(1, 10, x);
x = 13;
obj.count_divisible(21, 33, x);
x = 7;
obj.count_divisible(7, 29, x);
x = 2;
obj.count_divisible(0, 0, x);
x = 6;
obj.count_divisible(50, 120, x);
}
}
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
<?php
/*
Php program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
// Count the divisible number in the given range
public function count_divisible($start, $last, $x)
{
if ($start > $last)
{
//Change sequence
$this->count_divisible($last, $start, $x);
return;
}
else
{
$num = $start;
$counter = 0;
echo "\n Divisible by ". $x ." in range of [". $start ."-". $last ."] are : [";
while ($num <= $last)
{
if ($num % $x == 0)
{
// When x, is divisible by num
echo " ". $num ." ";
//When get divisible number then increase counter value
$counter++;
}
if ($counter > 0)
{
//visit to next divisible number
$num += $x;
}
else
{
$num++;
}
}
// Display calculated result
echo "]\n Result : ". $counter ."\n";
}
}
}
function main()
{
$obj = new DivisibleNumbers();
//Test case
$x = 4;
$obj->count_divisible(2, 38, $x);
$x = 3;
$obj->count_divisible(1, 10, $x);
$x = 13;
$obj->count_divisible(21, 33, $x);
$x = 7;
$obj->count_divisible(7, 29, $x);
$x = 2;
$obj->count_divisible(0, 0, $x);
$x = 6;
$obj->count_divisible(50, 120, $x);
}
main();
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
/*
Node Js program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
// Count the divisible number in the given range
count_divisible(start, last, x)
{
if (start > last)
{
//Change sequence
this.count_divisible(last, start, x);
return;
}
else
{
var num = start;
var counter = 0;
process.stdout.write("\n Divisible by " + x + " in range of [" + start + "-" + last + "] are : [");
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
process.stdout.write(" " + num + " ");
//When get divisible number then increase counter value
counter++;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num++;
}
}
// Display calculated result
process.stdout.write("]\n Result : " + counter + "\n");
}
}
}
function main()
{
var obj = new DivisibleNumbers();
//Test case
var x = 4;
obj.count_divisible(2, 38, x);
x = 3;
obj.count_divisible(1, 10, x);
x = 13;
obj.count_divisible(21, 33, x);
x = 7;
obj.count_divisible(7, 29, x);
x = 2;
obj.count_divisible(0, 0, x);
x = 6;
obj.count_divisible(50, 120, x);
}
main();
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
# Python 3 program
# Count all x divisible number in a range
class DivisibleNumbers :
# Count the divisible number in the given range
def count_divisible(self, start, last, x) :
if (start > last) :
# Change sequence
self.count_divisible(last, start, x)
return
else :
num = start
counter = 0
print("\n Divisible by ", x ," in range of [", start ,"-", last ,"] are : [", end = "")
while (num <= last) :
if (num % x == 0) :
# When x, is divisible by num
print(" ", num ," ", end = "")
# When get divisible number then increase counter value
counter += 1
if (counter > 0) :
# visit to next divisible number
num += x
else :
num += 1
# Display calculated result
print("]\n Result : ", counter ,"\n", end = "")
def main() :
obj = DivisibleNumbers()
# Test case
x = 4
obj.count_divisible(2, 38, x)
x = 3
obj.count_divisible(1, 10, x)
x = 13
obj.count_divisible(21, 33, x)
x = 7
obj.count_divisible(7, 29, x)
x = 2
obj.count_divisible(0, 0, x)
x = 6
obj.count_divisible(50, 120, x)
if __name__ == "__main__": main()
```

#### Output

```
Divisible by 4 in range of [ 2 - 38 ] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [ 1 - 10 ] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [ 21 - 33 ] are : [ 26 ]
Result : 1
Divisible by 7 in range of [ 7 - 29 ] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [ 0 - 0 ] are : [ 0 ]
Result : 1
Divisible by 6 in range of [ 50 - 120 ] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
# Ruby program
# Count all x divisible number in a range
class DivisibleNumbers
# Count the divisible number in the given range
def count_divisible(start, last, x)
if (start > last)
# Change sequence
self.count_divisible(last, start, x)
return
else
num = start
counter = 0
print("\n Divisible by ", x ," in range of [", start ,"-", last ,"] are : [")
while (num <= last)
if (num % x == 0)
# When x, is divisible by num
print(" ", num ," ")
# When get divisible number then increase counter value
counter += 1
end
if (counter > 0)
# visit to next divisible number
num += x
else
num += 1
end
end
# Display calculated result
print("]\n Result : ", counter ,"\n")
end
end
end
def main()
obj = DivisibleNumbers.new()
# Test case
x = 4
obj.count_divisible(2, 38, x)
x = 3
obj.count_divisible(1, 10, x)
x = 13
obj.count_divisible(21, 33, x)
x = 7
obj.count_divisible(7, 29, x)
x = 2
obj.count_divisible(0, 0, x)
x = 6
obj.count_divisible(50, 120, x)
end
main()
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
/*
Scala program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
// Count the divisible number in the given range
def count_divisible(start: Int, last: Int, x: Int): Unit = {
if (start > last)
{
//Change sequence
count_divisible(last, start, x);
return;
}
else
{
var num: Int = start;
var counter: Int = 0;
print("\n Divisible by " + x + " in range of [" + start + "-" + last + "] are : [");
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
print(" " + num + " ");
//When get divisible number then increase counter value
counter += 1;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num += 1;
}
}
// Display calculated result
print("]\n Result : " + counter + "\n");
}
}
}
object Main
{
def main(args: Array[String]): Unit = {
var obj: DivisibleNumbers = new DivisibleNumbers();
//Test case
var x: Int = 4;
obj.count_divisible(2, 38, x);
x = 3;
obj.count_divisible(1, 10, x);
x = 13;
obj.count_divisible(21, 33, x);
x = 7;
obj.count_divisible(7, 29, x);
x = 2;
obj.count_divisible(0, 0, x);
x = 6;
obj.count_divisible(50, 120, x);
}
}
```

#### Output

```
Divisible by 4 in range of [2-38] are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [1-10] are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [21-33] are : [ 26 ]
Result : 1
Divisible by 7 in range of [7-29] are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [0-0] are : [ 0 ]
Result : 1
Divisible by 6 in range of [50-120] are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

```
/*
Swift 4 program
Count all x divisible number in a range
*/
class DivisibleNumbers
{
// Count the divisible number in the given range
func count_divisible(_ start: Int, _ last: Int, _ x: Int)
{
if (start > last)
{
//Change sequence
self.count_divisible(last, start, x);
return;
}
else
{
var num: Int = start;
var counter: Int = 0;
print("\n Divisible by ", x ," in range of [", start ,"-", last ,"]are : [", terminator: "");
while (num <= last)
{
if (num % x == 0)
{
// When x, is divisible by num
print(" ", num ," ", terminator: "");
//When get divisible number then increase counter value
counter += 1;
}
if (counter > 0)
{
//visit to next divisible number
num += x;
}
else
{
num += 1;
}
}
// Display calculated result
print("]\n Result : ", counter ,"\n", terminator: "");
}
}
}
func main()
{
let obj: DivisibleNumbers = DivisibleNumbers();
//Test case
var x: Int = 4;
obj.count_divisible(2, 38, x);
x = 3;
obj.count_divisible(1, 10, x);
x = 13;
obj.count_divisible(21, 33, x);
x = 7;
obj.count_divisible(7, 29, x);
x = 2;
obj.count_divisible(0, 0, x);
x = 6;
obj.count_divisible(50, 120, x);
}
main();
```

#### Output

```
Divisible by 4 in range of [ 2 - 38 ]are : [ 4 8 12 16 20 24 28 32 36 ]
Result : 9
Divisible by 3 in range of [ 1 - 10 ]are : [ 3 6 9 ]
Result : 3
Divisible by 13 in range of [ 21 - 33 ]are : [ 26 ]
Result : 1
Divisible by 7 in range of [ 7 - 29 ]are : [ 7 14 21 28 ]
Result : 4
Divisible by 2 in range of [ 0 - 0 ]are : [ 0 ]
Result : 1
Divisible by 6 in range of [ 50 - 120 ]are : [ 54 60 66 72 78 84 90 96 102 108 114 120 ]
Result : 12
```

## Result Explanation

For the given test cases, the program correctly identifies the numbers divisible by 'x' within the specified range and outputs both the list of divisible numbers and the count. The output explanation has been provided in the initial response.

## Time Complexity

The time complexity of the provided code is O((last - start) / x), where 'last' is the ending number, 'start' is the starting number, and 'x' is the divisor. This is because the loop iterates through the range of numbers from 'start' to 'last', but in increments of 'x'. The number of iterations depends on how many numbers in this range are divisible by 'x'. The division factor 'x' reduces the number of iterations compared to iterating through every number in the range.

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