C++ Primer-while循环

编写程序：提示用户输入两个整数，打印出这两个整数所指定的范围内的所有整数的和。

 1 #include <iostream>
 2 #include <algorithm>
 3 int main()
 4 {
 5     std::cout<<"Enter two numbers:"<<std::endl;
 6     int sum = 0, val = 0, a = 0, b = 0, min = 0, max = 0;
 7     std::cin>>a>>b;
 8     min = std::min(a,b), max = std::max(a,b),val = min;
 9      while (val <= max)
10     {
11         sum += val;
12         ++val;
13         }
14     std::cout<<"The sum of "<<min<<" to "<<max<<"inclusive is "<<sum<<std::endl;
15     system("pause");
16     return 0;
17 }
View Code

 编写程序：提示用户输入两个整数，打印出这两个整数所指定的范围内的所有整数。

 1 #include <iostream>
 2 #include <algorithm>
 3 int main()
 4 {
 5     std::cout<<"Enter two numbers:"<<std::endl;
 6     int i = 1,val = 0,a = 0,b = 0,min = 0,max = 0;
 7     std::cin>>a>>b;
 8     min = std::min(a,b),max = std::max(a,b),val = min;
 9     while (val <= max){
10         std::cout<<"第"<<i<<"个数： "<<val<<std::endl;
11         ++i;
12         ++val;
13     }
14     system("pause");
15     return 0;
16 }
View Code

 不限定输入个数：

 1 #include <iostream>
 2 int main()
 3 {
 4     std::cout<<"Enter numbers: "<<std::endl;
 5     int sum = 0,val = 0;
 6     while (std::cin >> val){
 7         sum += val;
 8     }
 9     std::cout<<"The sum is: "<<sum<<std::endl;
10     system("pause");
11     return 0;
12 }
View Code

小结：输入完整数后，需要按住 Ctrl + Z（文件结束符） 再按 Enter 键

posted @ 2018-08-22 15:14  archerzon  阅读(178)  评论(0)  编辑  收藏  举报