int memcmp( const void* lhs, const void* rhs, size_t count );

#include 
#include 

using namespace std;

void display(char *lhs, char *rhs, int result, int count)
{
    if(result > 0)
        cout << rhs << " precedes " << lhs << endl;
    else if (result < 0)
        cout << lhs << " precedes " << rhs << endl;
    else
        cout << "First " << count << " characters of " << lhs << " and " << rhs << " are same" << endl;
}

int main()
{
    char lhs[] = "Hello World!";
    char rhs[] = "Hello Earth!";
    int result;

    result = memcmp(lhs, rhs, 5);
    display(lhs, rhs, result, 5);
    
    result = memcmp(lhs, rhs, 7);
    display(lhs, rhs, result, 7);
    return 0;
}

First 5 characters of Hello World! and Hello Earth! are same
Hello Earth! precedes Hello World!