C++循环whiledo whilefor
三种循环whiledo whileforfro循环优化实例C++中提供了三种循环语句：while,do while和forwhilewhile(表达式){循环体语句}int sum = 0;int index = 1;while(index <= 100){ sum += index; index +=1;}cout << sum << endl; //5050do whiledo{循环体语句}while(表达式);int s
