c++ - 返回到代码块的开头

Question

我是 C++ 的新手，但我正在编写一个简单的程序，我将如何返回到代码的开头，同时仍然让它记住输入的内容。例如，假设我按 1 而不是输入名称，我将如何返回到询问您想要什么的主要部分。谢谢你的时间，我很感激

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

int main(int argc, char *argv[])
{
char name[25];
char address[25];
char city[25];
char state[25];
char zip[25];
char phone[25];
 int reply;

cout <<"Press 1 to enter the name"<<endl; 
cout <<"Press 2 to enter the address"<<endl;
cout <<"Press 3 to enter the city"<<endl;
cout <<"Press 4 to enter the state"<<endl;
cout <<"Press 5 to enter the zip"<<endl;
cout <<"Press 6 to enter the phone"<<endl;
cin >>reply;
if (reply = 'one')
 { cout << " Enter the name" << endl;
  cin >> name;
   cin.ignore(80, '\n');}
else if (reply = 'two')
    {cout << " Enter the address" << endl;
    cin >> address;
     cin.ignore(80, '\n');}
else if (reply = 'three')
    {cout << " Enter the city" << endl;
   cin >> city;
    cin.ignore(80, '\n');}
else if (reply = 'four')
    {cout << " Enter the state" << endl;
    cin >> state;
    cin.ignore(80, '\n');}
else if (reply = 'five')
   { cout << " Enter the zip code " << endl;
     cin >> zip;
     cin.ignore(80, '\n');}
else if (reply = 'six')
   { cout << " Enter the phone number " << endl;
    cin >> phone;
     cin.ignore(80, '\n');}
else
{cout << " done";}





system ("PAUSE");
return EXIT_SUCCESS;

Answer 1

注意这里的条件:

int reply;
cin >>reply;
if (reply = 'one')
    ...

实际上应该是:

if (reply == 1)

放在 ' ' 之间的文字指的是单个 char，对于字符串你应该使用 " " 而对于数字文字，例如 int，只需使用数字。您还应该添加一个将停止程序的选项:

cout << "Press 1 to enter the name" << endl; 
cout << "Press 2 to enter the address" << endl;
...
cout << "Press 0 to stop" << endl;                // <-- something like this

并将这段代码用一个循环包裹起来。另请注意，变量无需在函数开头声明。

---

它可能看起来像下面这样:

// print choices (press *** to ...)
int reply;
while (cin >> reply) {
    if (reply == 0)
        break;
    // some code...
    // print choices
}