C what are the differences between for, while and do-while loops?

This article mainly introduces the differences between the c language for, while and do-while cycle, the article is very detailed, has a certain reference value, interested friends must read it!

For,while,do-while distinction

Cyclic structure

1. Initialize variables:

Initialization variables defined in for loops can only be used by themselves; while and do-while loops, initialization variables are already outside, so they can also be used outside.

2. Times of execution:

The for loop and the while loop are (judge before execution), but the do-while loop is (execute before judgment).

3. The universality of use is different:

In most cases, the three loops can be switched back and forth. But where the number of times is determined and the scope is determined, the for loop is used.

Detailed examples are as follows:

Programming calculation 1 "2" 3 +. + 100

a. Using for Loop

# include int main () {int iJING summing 0; for (iSome1teri