do while c 2b 2b

1do {
2   // codes;
3}
4while (testExpression);

1while (test_expression)
2{
3   // statements
4 
5  update_expression;
6}

1while (x != 0){ ... }

1do
2{
3   statement(s);
4} while(condition);

1//Executes a statement repeatedly, until the value of condition becomes false.
2//The test takes place before each iteration
3while(condition) {
4  statement
5}

1#include <iostream>
2#include <string>
3using namespace std;
4 
5int main()
6 {
7   cout<<"Printing 2's multiples less than 20"<<endl;
8   int i=2;
9   do
10   {
11   cout<<"i = "<<i<<"\t";
12     i += 2;
13   }while(i<=20);
14 }
15