do {
...
} while (true);
这个例子中的
true示例：
do {
cout << " 1-basic arithmetic operations " << endl;
cout << " 2-summation " << endl;
cout << " 3-Exit " <<endl;
cout << "Enter your choice: " << endl;
cin >> main_choice;
switch(main_choice){
case 1:
operation();
break;
case 2:
summation();
break;
case 3:
cout << "Exiting program. Goodbye!" << endl;
return 0;
default:
cout << "Invalid choice. Please try again." << endl;
}
} while (true);
使用 do-while 结构时，可以使用以下语法：
do{
<body>
} while(<condition>)
这里，
<condition><body>使用 do-while 构造，您总是在评估条件之前执行
<body>如果
<condition>