nested for looping

[lanceTCT]

well...i don't understand how the nested looping work...can anyone explain clearly for me??

#include <iostream>
using namespace std;
int main()
{
	for ( int i = 4 ; i >0  ; i--){
		for ( int j = i ; j < 4 ; j++){
			cout<<" ";
		}
		for( int j = i  ; j >0 ; j--){
			cout<<j;
		}
		cout<<endl;
	}
	return 0;
}

and the output is

4321
 321
  21
   1

why it will become like that? my lecturer didn't explain well for me...

[Disch]

nested loops are not really a new concept. If you understand how a single loop works, then you can understand how nested loops work. The inner loops are just another code segment that is looped.

To understand that code you posted, simply walk through it.

[biplav17]

Take a value and use the traingle to see what happens. It was so difficult for me and now i understand. Run through the program taking a value.

btw your syntax and coding is incorrect

[lanceTCT]

kk...thanks for u guys!!