How to understand the logic of this question?-CodePudding

Task:

Scan 2 numbers outerNumber and innerNumber. Iterate from [0, outerNumber). Inside that loop, iterate from [0, innerNumber). In the inner iteration print the sum of both the iterators.

Note:

[x, y] means all numbers from x to y including both x and y.
[x, y) means all numbers from x to y excluding y.
(x, y] means all numbers from x to y excluding x.
(x, y) means all numbers from x to y excluding both x and y.

Sample Input:
3 5
Expected Output:
0 1 2 3 4
1 2 3 4 5
2 3 4 5 6

Explanation:
outerIterator=0, innerIterator=0 → 0 0 = 0
outerIterator=0, innerIterator=1 → 0 1 = 1
outerIterator=0, innerIterator=2 → 0 2 = 2
outerIterator=0, innerIterator=3 → 0 3 = 3
outerIterator=0, innerIterator=4 → 0 4 = 4
outerIterator=1, innerIterator=0 → 1 0 = 1
outerIterator=1, innerIterator=1 → 1 1 = 2
outerIterator=1, innerIterator=2 → 1 2 = 3
outerIterator=1, innerIterator=3 → 1 3 = 4
outerIterator=1, innerIterator=4 → 1 4 = 5
outerIterator=2, innerIterator=0 → 2 0 = 2
outerIterator=2, innerIterator=1 → 2 1 = 3
outerIterator=2, innerIterator=2 → 2 2 = 4
outerIterator=2, innerIterator=3 → 2 3 = 5
outerIterator=2, innerIterator=4 → 2 4 = 6//

This is problem statement of the code and below that explanantion is given, but still I didn't understand how the output is coming.

I would be keen to learn how zeros, 1 and 2 are coming 5 times in Outeriterator and same in InnerIterator

CodePudding user response：

Simply, it's nested loop with both outer and inner numbers as the range for both loops. You can implement it easily as:

for(out = 0; out < outerNumber; out  ){
  for(in = 0; in < innerNumber; in  ){
    printf("%d ",out   in);
  }
  printf("\n");
}

CodePudding user response：

Outer is [0,3), so 0,1,2 is the amount of iterations.

Inner is [0,5), so 0,1,2,3,4 iterations.

Each value from outer requires you to run all the inner values once, so the first time for outer = 0 you will have 0,1,2,3,4 because 0 [0,5) is 0 0, 0 1, 0 2, 0 3, 0 4.

For outer = 1 you will do the same but add 1 instead of 0.

For outer = 2, same thing 2 0,2 1,2 2,2 3,2 4.

In code should be something close to this:

for (i = 0 ; i<3 ; i  ){

    for (x = 0; x<5; x  ){

        printf i x;
    }

}

Best of luck to you