How the nested loop works in c++

Question

Logic behind the nested loop

Answer 1

Thanks for the help👍

Answer 2

Thanks

Answer 3

Nested FOR loop means a for loop within a FOR loop. It does not how many loops are there in a FOR loop.
A instance of this,if u consider this loop

for (int i=1;i<10;i++) // loop 1
{ // start of outer loop
for(int j=1;j<=i;j++) //loop 2
{ // start of inner loop
cout << j << endl;
} // end of inner loop
} // end of outer loop

1. In loop 1 Control , assign i=1 then checks condition of i<10 after that control shifts to loop 2

2 Now In loop 2 , j is assign =1, then control checks for condition j<=1 i.e 1<=1
so now as condition is true,it now moves inward now it finds statement to print the value of j so it prints 1 now control moves to update statement of loop 2 where increment of j occurs and value of j becomes 2.

3 Now control shifts to condition( of loop 2 ) j<=i,but now j=2 so condition is false so control moves out of the inner loop and control is transferred to the outer loop's update part(i++)

4 As i becomes 2, there is a check of condition (i<10), after than again same as step 2 j=1, prints 1
2

when i=3 it prints 1
2
3

likewise it executes till i=10....