for_star_2.cpp

来自「在c环境下的对数据结构进行讲解,包含有例题及答案」· C++ 代码 · 共 31 行

 //loop_con.cpp
 #include <iostream.h>
 #include <conio.h>
 void main()
 { int n,sum=0;
   for (;;)				//永为true
   { cout << "for n=";
     cin >> n;
     if (n==0) break;		//当输入0时退出for(;;)
     sum += n;
   }
   cout << "sum [for]="<<sum<<endl;
   sum=0;
   while(1)				//永为true
   { cout << "while n=";
     cin >> n;
     if (n==0) break;		//当输入0时退出while(1)
     sum += n;
   }
   cout << "sum [while]="<<sum<<endl;
   sum=0;
   do
   { cout << "do...while n=";
     cin >> n;
     if (n==0) break;		//当输入0时退出do...while(true)
     sum += n;
   }while(true);			//永为true
   cout << "sum [do...while]="<<sum<<endl;
   getch();
 }