lst-0025-book.cpp
// https://godbolt.org/z/h466fYq4W
#include <iostream>
int main() {
/* Sum up from 1 to 100 */
int sum = 0;
int number = 1;
while(number <= 100) // condition
{ // block that is repeatedly executed
sum += number; // for the result
number += 1; // next number
} // end of the repeated block
std::cout << sum << std::endl;
}