Topic Edit: 프로그래밍 독학 중 질문

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Now Editing “프로그래밍 독학 중 질문”

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이런 페이지가 나왔는데 인터넷으로 간단하게 설명된 동영상을 찾아보려고 합니다. 
symmetric, asymmetic 이해가 잘 안가는데
찾아보니 너무 광범위해서 .... 어떤 키워드로 찾아보면 될지 혹시 알 수 있을까요....
감사합니다.

Choose Loop Bounds That Match Your Task

Suppose you want to print line numbers that go from 1 to 10. Of course, you will want to use a loop

for (int i = 1; i &lt;= 10; i++)
The values for i are bounded by the relation 1 ≤ i ≤ 10. Because there are ≤ on both bounds, the bounds are called symmetric.

When traversing the characters in a string, it is more natural to use the bounds

for (int i = 0; i &lt; str.length(); i++)
In this loop, i traverses all valid positions in the string. You can access the ith character as str.substr(i, 1). The values for i are bounded by 0 ≤ i &lt; str.length(), with a ≤ to the left and a &lt; to the right. That is appropriate, because str.length() is not a valid position. Such bounds are called asymmetric.

In this case, it is not a good idea to use symmetric bounds:

for (int i = 0; i &lt;= str.length() - 1; i++) // Use &lt; instead
The asymmetric form is easier to understand.

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