reverse string stl code example

Example 1: string reverse stl

int main() { 
    string str = "foobarbaz";
    reverse(str.begin(), str.end()); 
    cout << str; // prints "zabraboof"
    return 0; 
}

Example 2: std::reverse

std::vector<int> v{1,2,3};
    std::reverse(std::begin(v), std::end(v));

Example 3: reverse string shwll

var="12345"
copy=${var}

len=${#copy}
for((i=$len-1;i>=0;i--)); do rev="$rev${copy:$i:1}"; done

echo "var: $var, rev: $rev"