Zookeeper
Analysis of several cases with the const keyword
Const modified code
Meaning (features)
Equivalence
Int * P = & num;
1. You can read yourself2. You can change yourself through * P.3. You can view other users
I believe many cppers, like me, have been hovering in pointers and references for a long time. We often mix pointers and references, especially when we see the usage listed in the question, which really hurt our brains.
Later, I used it in the
1 start with const int IYou know, when declaring a variable, int I is like this; this I may be re-assigned to it. As follows:Int I = 0;//...I = 20; // The value is assigned again here.However, one day my program may need such a variable (temporarily
1 start with const int IWith the const modified IC, we do not call it a variable, but a symbolic constant, representing the number of 20. This is the role of Const. An IC cannot be re-assigned to it.After understanding the role of const, we also
Reprinted from: http://blog.csdn.net/yjh0628/article/details/5830153
1 starting from const int nConst int n = 20, with the const modified NWe do not call it a variable, but a symbolic constant, which represents the number of 20. This is the role
During MySQL query time period, it will be more efficient to select INT, or will it be more efficient to select DateTime? To solve this problem, we will perform a test to see whether INT or DateTime should be used in the MySQL query
Description of whether the MySQL time field uses INT or DateTime. When parsing DEDECMS today, we found that the MYSQL time fields of deder all use 'senddata' int (10) unsignedNOTNULLDEFAULT0. then we found this article online, it seems that if the
When parsing DEDECMS today, we found that the MYSQL time fields of deder use the INT type, and then we found this article online. it seems that if the time field is involved in the calculation, it would be better to use the int type, first, you do
When parsing DEDECMS today, we found that the MYSQL time fields of deder use the INT type, and then we found this article online. it seems that if the time field is involved in the calculation, it would be better to use the int type, first, you do
Today, when parsing dedecms, the MySQL time field found in Deder is usedint (notNULLDEFAULT'0';Then found this article on the Internet, it seems that if the time field has to participate in the operation, with int better, one does not have to
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