一个简单的数组问题

database

#include "iostream.h"
class Dealer
{
char firstName[2];
char lastName[25];
char city[25];
char phoneNo[11];
public:
void display()
{
cout << "First Name: ";
cout << firstName <<" ";
cout <<"Last name: ";
cout << lastName << endl;
cout << "City: ";
cout << city<<" ";
cout << "hone number: ";
cout << phoneNo << endl;
}
void get()
{
cout << "First name: ";
cin >> firstName;
cout << endl << "Last Name: ";
cin >> lastName;
cout << endl << "City: ";
cin >> city;
cout << endl << "Residence phone number: ";
cin >> phoneNo;
}
};

int main()
{
Dealer d1;
d1.get();
d1.display();
return 0;
}

为什么输入 First name: jlk;j;lk

Last Name: nj

City: g

Residence phone number: 45
结果是
First Name: jlnj Last name: nj
City: g Phone number: 45

seamew

你的firstname数组只定义了两个字节的空间，你输入时又敲了那么多字符。

phinux

应该是你的数组元素个数太小,你试着在每个部分都输入超过数组元素个数的信息,你会发现你的firstname足够长,甚至还有city号,连lastname也有你的city号,可见是: g++ 在内存管理方面的问题,它把你的fristname 和 lastname数组的内存紧连着分配,所以当你输入超过你预定元素的个数时,数组最后的 "\0"就会被取消,因此正好连着你的lastname