C :

#include<string.h>
#include<stdio.h>
int main()
{
    int m,a,c,b;
    scanf("%d",&m);
    a=m/100;
    b=m/10%10;
    c=m%10;
    if(a>b&&b>c)
        printf("%d",a-c);
    if(a>c&&c>b)
        printf("%d",a-b);
    if(c>b&&b>a)
        printf("%d",c-a);
    if(c>a&&a>b)
        printf("%d",c-b);
    if(b>a&&a>c)
        printf("%d",b-c);
    if(b>c&&c>a)
        printf("%d",b-a);
    return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int b = n / 100;
	int s = n / 10 % 10;
	int g = n % 10;
	
	int ma = b;
	int mi = b;
	if(s > ma) ma = s;
	if(s < mi) mi = s;
	if(g > ma) ma = g;
	if(g < mi) mi = g;
	
	cout<<ma - mi;
}

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int a = n % 10;
		int b = n / 10 % 10;
		int c = n / 100;
		int t;
		if(a > b){
			t = a;
			a = b;
			b = t;
		}if(b > c){
			t = b;
			b = c;
			c = t;
		}if(a > b){
			t = a;
			a = b;
			b = t;
		}
		int s = c - a;
		System.out.println(s);
		sc.close();
	}

}

Python :

n = int(input())
b = n // 100
s = n // 10 % 10
g = n // 1 % 10
if b > s and b > g and s > g:
    print(b - g)
if b > s and b > g and s < g:
    print(b - s)
if s > b and s > g and b > g:
    print(s - g)
if s > b and s > g and b < g:
    print(s - b)
if g > s and g > b and s > b:
    print(g - b)
if g > s and g > b and s < b:
    print(g - s)