字符串数组 输入3个字符串，要求按由小到大的字母顺序输出; 输入n个学生的姓名和学号到字符串数组中，在输入一个姓名，如果班级有该生则返回其信息，否则返回本班无此人

#include<iostream>
#include<string>
using namespace std;
string name[50],num[50];
int n;
int main()
{void input_data();
void search(string find_name);
string find_name;
cout<<"please input number of this class:";
cin>>n;
input_data();
cout<<"please input name you want find:";
cin>>find_name;
search(find_name);
return 0;
}
void input_data()
{int i;
for(i=0;i<n;i++)
{cout<<"input name and NO. of student"<<i+1<<":";
cin>>name[i]>>num[i];
}
}
void search(string find_name)
{int i;
bool flag=false;
for(i=0;i<n;i++)
if(name[i]==find_name)
{cout<<name[i]<<"has been found,his number is"<<num[i]<<endl;
flag=true;
break;
}
if(flag==false)cout<<"can't find this name";
}