In this article, we will learn about c++ do while loop control statement, if you want to learn about control statement please click here.
The C++ do-while loop is used to iterate a part of the program several times. If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use do-while loop.
The C++ do-while loop is executed at least once because condition is checked after loop body.
Syntax for C++ do while loop
do {
statement(s);
}
while( condition );Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop execute once before the condition is tested.
If the condition is true, the flow of control jumps back up to do, and the statement(s) in the loop execute again. This process repeats until the given condition becomes false.
Example 1 of do while loop
#include <iostream>
using namespace std;
int main () {
// Local variable declaration:
int a = 10;
// do loop execution
do {
cout << "value of a: " << a << endl;
a = a + 1;
} while( a < 20 );
return 0;
}value of a: 10 value of a: 11 value of a: 12 value of a: 13 value of a: 14 value of a: 15 value of a: 16 value of a: 17 value of a: 18 value of a: 19
Example 2 of do while loop
#include <iostream>
using namespace std;
int main() {
int i = 1;
do{
cout<<i<<"\n";
i++;
} while (i <= 10) ;
} 1 2 3 4 5 6 7 8 9 10
