c++ simple cords to search

#include <iostream>
#include<string>
using namespace std;


struct student
{string snum;
string stnam;
int marks;
}starry[3];


void inputdata();
void display(string num);
void main()

{
string num;
inputdata();//call input data function
cout<<"Enter Student number to search";
cin>>num;
display(num);//call display function

system("pause");
}

void display(string num)
{
bool found=false;
for (int i=0; i<3; i++)
{
if (num==starry[i].snum)
{
found=true;
cout<<"student id "<<starry[i].snum<<endl;
cout<<"student name"<<starry[i].stnam<<endl;
cout<<"student marks "<<starry[i].marks<<endl;
cout<<"\n\n";
break;
}
}//end for

if(found==false)
{
cout<<"invalid number"<<endl;
}
}

void inputdata()
{
for (int i=0;i<3;i++)
{
cout<<"Enter Student number: ";
cin>>starry[i].snum;
cout<<"enter Student name: ";
cin>>starry[i].stnam;
cout<<"Enter marks: ";
cin>>starry[i].marks;
cout<<"completed";
cout<<"\n";
cout<<"\n";
}
}