//1) WHILE#include <iostream>using namespace std;int main() { double h = 4; double S = 0; double k = 5; while (k <= 51) { S = S + sqrt(k); k = k + h; } cout << "Sum = " << S << endl; system("pause"); return 0;}//2) DO WHILE#include <iostream>using namespace std;int main() { double h = 4; double S = 0; double k = 5; do { S = S + sqrt(k); k = k + h; } while (k <= 51); cout << "Sum = " << S << endl; system("pause"); return 0;}