do-while loop

Conditionally executes a statement repeatedly (at least once).

# Notes

As part of the C++ forward progress guarantee, the behavior is undefined if a loopthat is not a trivial infinite loop(since C++26) without observable behavior does not terminate. Compilers are permitted to remove such loops.

# Example

#include <algorithm>
#include <iostream>
#include <string>
 
int main()
{
    int j = 2;
    do // compound statement is the loop body
    {
        j += 2;
        std::cout << j << ' ';
    }
    while (j < 9);
    std::cout << '\n';
 
    // common situation where do-while loop is used
    std::string s = "aba";
    std::sort(s.begin(), s.end());
 
    do std::cout << s << '\n'; // expression statement is the loop body
    while (std::next_permutation(s.begin(), s.end()));
}

# See also

C documentation