How to use the for loop of C++
This article mainly introduces "how to use C++ 's for cycle". In daily operation, I believe many people have doubts about how to use C++ 's for loop. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use C++ 's for cycle". Next, please follow the editor to study!
ES.86: avoid modifying loop control variables in the loop body of a basic for loop
Reason (reason)
The loop control up front should enable correct reasoning about what is happening inside the loop. Modifying loop counters in both the iteration-expression and inside the body of the loop is a perennial source of surprises and bugs.
External loop control should allow people to correctly speculate what is going on inside the cycle. Whether in the iterative representation formula or in the ring body, modifying the loop count will increase the difficulty of understanding and even lead to errors.
Example (sample)
For (int I = 0; I < 10; + + I) {
/ / no updates to i-- ok
}
For (int I = 0; I < 10; + + I) {
/ /
If (/ * something * /) + + I; / / BAD
/ /
}
Bool skip = false
For (int I = 0; I < 10; + + I) {
If (skip) {skip = false; continue;}
/ /
If (/ * something * /) skip = true; / / Better: using two variables for two concepts.
/ /
}
Enforcement (implementation recommendations)
Flag variables that are potentially updated (have a non-const use) in both the loop control iteration-expression and the loop body.
Situations in which marked (loop) variables may be modified (non-constant parameters are used) are included in the iterative representation formula and inside the loop body.
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