I have problem with this code c++

Question

#include"iostream.h"
#include "string.h"
#include "conio.h"
#include "stdio.h"
int con(char a[10][20] , char b[10][20] ,char c[10][20] ,int n1 ,int n2)
{ int k=0,i,j,n3;
for(i=0;i<=n1;i++)
for(j=0;j<=n2;j++)
{ strcpy (c[k],a[i]);
strcat(c[k],b[j]);
k++;}
n3=n1*n2;
return(n3); }
void main()
{ clrscr();
char s[10][20],s1[10][20],s2[10][20],s3[10][20],sstar[20][40];
int i,n,n1,n2,n3,h=0;
cout<<"ENTER n \n";
cin>>n;
for(i=0;i<n;i++)
gets(s[i]);
n1=n;
for (i=0;i<n1;i++)
strcpy(s1[i],s[i]);
cout<<"s={";
for(i=0;i<n;i++)
{ cout<<s[i];
if(i<n-1)
cout<<",";
}
cout<<"} \n";
cout<<"s1={";
for(i=0;i<n1;i++)
{ cout<<s1[i];
if(i<n1-1)
cout<<"," ; }
cout<<"} \n";
n2=con(s1,s,s2,n1,n);
cout<<"s2={";
for(i=0;i<n2;i++)
{ cout<<s2[i];
if(i<n2-1)
cout<<","; }
cout<<"}\n";
n3=con(s2,s,s3,n2,n);
cout<<"s3={";
for(i=0;i<n3;i++)
{ cout<<s3[i];
if(i<n3-1)
cout<<",";}
cout<<"} \n";
//h=0;
strcpy(sstar[h],"null");
h++;
for (i=0;i<n1;i++)
{strcpy(sstar[h],s1[i]);
h++;}
for(i=0;i<n2;i++)
{ strcpy(sstar[h],s2[i]);
h++;}
for(i=0;i<n3

Answer 1

If anyone how this code. Work
Plz contact with me on telegram.

@IX_HAIDER_XI