To make the program more useful for aging population, this assignment shall perf

Question

To make the program more useful for aging population, this assignment shall perform the same whole name or partial name search as in Program Challenge 10- 18 with one additional feature:

The search shall return all results with no typos, or one letter typo, or one digit typo with the same string length of the entered search pattern. The letters including a-z and A-Z characters. The digits include 0-9. No other characters are not required to be included in this program. For example,
*case 1: search on "8765" also returns the following matched patterns: "8767", "8865", "8715", ...etc.
*case 2: search on "abcd" also returns the following matched patterns: "abcb", "zbcd", "abad", ...etc.

i made code until no typo..

but i dont know how to make one typo

this is my code

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

int main()
{
const int num=11;
const int length=27;
char people[num][length] = {"Becky Warren, 555-1223",
        "Joe Looney, 555-0097",
        "Geri Palmer, 555-8787",
        "Lynn Presnell, 555-1212",
        "Holly Gaddis, 555-8878",
        "Sam Wiggins, 555-0998",
        "Bob Kain, 555-8712",
        "Tim Haynes, 555-7676",
        "Warren Gaddis, 555-9037",
        "Jean James, 555-4939",
        "Ron Palmer, 555-2783"};

char lookUp[length];
char *strPtr = NULL;
int i;

cout<< " People and Phone numbers"<<endl;
cout<< "Enter name or phone number: ";

cin.getline(lookUp, length);

cout<<"result: "<<endl;

for (i=0; i<num; i++)
{  
  strPtr = strstr(people[i], lookUp);

  if (strPtr != NULL )
  {
   cout<<" "<<people[i]<<endl;
  }
}
  
if (strPtr == NULL )
{
  cout << "No matching product was found"<<endl;
}
  
  
}

Explanation / Answer

I can't use the system(pause) and the results turn out to be double. How can I fix this ?

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