Nested for Loop in C | Nested for Loop Execution

Nested for Loop in C

• One for loop within another for Loop is called nested for Loop

Nested Loop Execution :

for ( i =0 ; i<2 ; i++ )
   for ( j =0 ;j<2 ; j++ )
   {
   printf ( "%d%d" , i , j )
   }

Steps :

Step No	What happens ?	Line
1	i = 0	1
2	i < 2 True Condition	1
3	Enter into Inner for Loop	2
4	Again j = 0 True	2
5	j < 2 True Condition	2
6	Execute Line 4	4
7	But Inner for Loop has not completed yet , Control Goes to line no : 2 again	2
8	Execute : j ++	2
9	Now j = 1	2
10	Check j < 2	2
11	True Condition Execute Line 4	4
12	Execute : j ++	2
13	Now j = 2	2
15	Check j < 2	2
16	False Condition	2
	************ At this Stage the Inner for Loop Completely Executed .
17	Execute i ++	1
18	Now i = 1 Check Condition          i < 2	1
19	True Condition Goto Inner for Loop Similar to STEP 3 in this Table .
20	Execute All Remaining Steps

Posted in: Nested for Loop