1.4.1练习

1.9

#include<iostream>int main() {    int sum = 0, val = 50;    while (val <= 100) {        sum += val;        ++val;    }    std::cout << "50到100的和是" << sum<<std::endl;    return 0;}

1.10

#include<iostream>int main() {    int i = 9;    while (i>0) {        std::cout << i << std::endl;        --i;    }    return 0;}

1.11

#include<iostream>int main() {    int min, max;    std::cout << "请从小到大输入2个整数:" << std::endl;    std::cin >> min >> max;    while (min<(max-1)) {        ++min;        std::cout << min << std::endl;    }    return 0;}

注：暂时只能从小到大输入2个整数