Program in C++ to find greatest prime number from array Using function

Program in C++ to find greatest prime number from array Using function

#include<iostream>
 using namespace std;
 int maxPrime(int a[],int n)
  {
   int i,p,j,l=0;
   for(i=0;i<n;i++)
    {
     for(p=1,j=2;j<=a[i]/2;j++)
      {
       if(a[i]%j==0)
         {
          p=0;
          break;
    }
   }
   if(p==1)
     {
      if(a[i]>l)
       l=a[i];
        }
     }
 return l;
  }
  int main()
   {
     const int size=35;
     int arr[size],n,m=0;
     cout<<"Enter the size of array:-";
     cin>>n;
     if(n>size)
      {
       cout<<"Invalid array size!.";
       return 0;
  }
  cout<<"Enter "<<n<<" numbers:-";
     for(int i=0;i<n;i++)
      {
       cin>>arr[i];
  }
   cout<<"Greatest Prime numbers "<<maxPrime(arr,n);
      return 0;
   }

Output:-

Note: If not any prime number present in array.

#include<iostream>
 using namespace std;
  int maxPrime(int a[],int n)
  {
   int i,p,j,l=0,flag=0;
   for(i=0;i<n;i++)
    {
     for(p=1,j=2;j<=a[i]/2;j++)
      {
       if(a[i]%j==0)
         {
          p=0;
          break;
    }
   }
   if(p==1)
     {
      flag=1;
      if(a[i]>l)
       l=a[i];
        }
     }
 if(flag==0)
   {
    cout<<"Not any elements are prime no.!";
    return 0;
   }
 return l;
  }
  int main()
   {
     const int size=35;
     int arr[size],n,l;
     cout<<"Enter the size of array:-";
     cin>>n;
     if(n>size)
      {
       cout<<"Invalid array size!.";
       return 0;
  }
  cout<<"Enter "<<n<<" numbers:-";
     for(int i=0;i<n;i++)
      {
       cin>>arr[i];
  }
   l=maxPrime(arr,n);
   if(l>0)
    cout<<"Greatest Prime numbers "<<l;
      return 0;
   }

Output:-