How do I create a C or C++ program to search a name ?

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Question: In a room , there are three students Yuki, Shiro and Kaname. You have to display that their name exists on giving the input.
Also ,please give me the corrected program.

Example:
INPUT:
Enter no of students: 3 (no of students)
Enter name:
Yuki
Shiro
Kaname

Enter name to be searched: Shiro

OUTPUT:
Shiro exists!!

What I have tried:

C++

#include <iostream>
#include <string.h>
using namespace std;
int main()
{
    string s[10], y;
    int i;
    for (i=0; i< 3; i++)
        cin>>s[i];
    cin>>y;
    if (y == s[i])   
        cout<< y << " exists";
    else
        cout<< y <<"Does not exist";
    return 0;
}

Posted 19-Jan-18 1:06am

Renshinzen

Updated 16-Oct-20 6:39am

Richard MacCutchan

v5

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3 solutions

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Richard MacCutchan · Accepted Answer · 2018-01-19T01:21:00

You have two main problems. Firstly you are including <string.h> which is the old C library header; it should be just <string> for the standard template library.
Secondly, you compare the search field with a blank string, instead of searching each in turn, so the search entry will never be found.

C++

    if (y == s[i])   // at this point i == 3, so s[i] has no value
        cout<< y << " exists";

// you should write:
    for (i=0; i < 3; i++)
    {
        if (y == s[i])
        {
            cout << y << " exists";
            break;
        }
    }
    if (i == 3)
        cout << y <<" Does not exist"; // loop terminated without finding the key

CPallini · Accepted Answer · 2018-01-19T01:23:00

You forgot a loop:

C++

#include <iostream>
#include <string>
using namespace std;
int main()
{
    string s[10], y;
    int i;
    for (i=0; i< 3; i++)
        cin>>s[i];
    cin>>y;

  for (i=0; i<3; ++i) // use a loop for searching in all the entered items
  {
    if (y == s[i])
    {
      cout<< y << " exists";
      return 0;;
    }
  }
  cout<< y <<" does not exist";
}

Please note: C++ STL gently provides the set[^] class:

C++

#include <iostream>
#include <string>
#include <set>
using namespace std;
int main()
{
  set<string> folks;

  for (int i=0; i< 3; i++)
  {
    string new_member;
    cin >> new_member;
    folks.insert(new_member);
  }

  string name_to_search_for;
  cin >> name_to_search_for;

  cout << name_to_search_for;
  if ( folks.find(name_to_search_for) == folks.end())
    cout << " not";
  cout << " found." << endl;
}

Jochen Arndt · Accepted Answer · 2018-01-19T01:16:00

Solution 1

Just add code for what is actually missing according to the example:

Print the prompt texts (number of students, name to be searched) so that the user knows what to enter
Read the number of names to be entered
Print the result as shown in the example (it includes the entered name)

Posted 19-Jan-18 1:16am

Jochen Arndt

How do I create a C or C++ program to search a name ?

3 solutions

Solution 2

Solution 3

Solution 1

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