objective-c - How should these three types of process control be expressed in OC? ?

Question

How should these three types of process control be expressed in OC? ?

Answer 1

This has nothing to do with OC, it is a pure C concept. Most computer languages ​​also have these three loop controls.

1. while: while(p) {a}

2. do-while: do{a} while(p)

3. for: for(a; p;) {b; a;}

Answer 2

I don’t know the answer, please support me!