Java practise programs 26-09-23

int n=-1234;
		int r=0;
		n = n<0?-n:n;
		while(n>0){
		    int n1=n%10;
		    r=r*10+n1;
		    n/=10;
		}
		System.out.println(r);
		
		int n=8;
		int n1=0,n2=1;
		System.out.print(n1+" "+n2+" ");
		for(int i=2;i<n;i++){
		    int s=n1+n2;
		    System.out.print(s+" ");
		    n1=n2;n2=s;
		}
		
		int n1=98,n2=56;
		int s=Math.min(n1,n2);
		int l=Math.max(n1,n2);
		while(l%s!=0){
		    s=l%s;
		}
		System.out.print(s);

        int n=42;
        int m=n/2;
        int s=0;
        for(int i=1;i<=m;i++){
            if(n%i==0){
                s+=i;
            }
        }
        System.out.print(s==n);
        
        String s1="silent";
        String s2="listen";
        char[] arr1=s1.toCharArray();
        char[] arr2=s2.toCharArray();
        Arrays.sort(arr1);
        Arrays.sort(arr2);
        System.out.print(Arrays.equals(arr1,arr2));


		27-09-23===================================
          
        int []arr = {6,0,3,5,1,4,2};
		for(int i=0;i<arr.length-1;i++){
		    for(int j=i+1;j<arr.length;j++){
		        if(arr[i]>arr[j]){
		            arr[i]=arr[i]+arr[j];
		            arr[j]=arr[i]-arr[j];
		            arr[i]=arr[i]-arr[j];
		        }
		    }
		}
		for(int i:arr){
		    System.out.print(i+" ");
		}
		
		int a=10,b=21;
		a=(a+b);
		b=a-b;
		a=a-b;
		System.out.println(a+" "+b);

        String s="reppeaated";
        char c[]=s.toCharArray();
        Arrays.sort(c);
        char s1=' ';
        for(int i=0;i<c.length-1;i++){
            if(c[i]==c[i+1]){
                s1=c[i];
                continue;
            }
            if(i+1==c.length-1)
                System.out.print(c[i+1]);
            if(c[i]!=s1)
                System.out.print(c[i]);
        }