strchr function in c++

// CPP program to demonstrate working of strchr() 
#include <iostream> 
#include <cstring> 
using namespace std; 
// Driver code 
int main() 
{ 
    char str[] = "My name is Ayush"; 
    char ch = 'A', ch2 = 'z'; 
    if (strchr(str, ch) != NULL) 
        cout << ch << " "
             << "is present in string" << endl; 
    else
        cout << ch << " "
             << "is not present in string" << endl; 
    if (strchr(str, ch2) != NULL) 
        cout << ch2 << " "
             << "is present in string" << endl; 
    else
        cout << ch2 << " "
             << "is not present in string" << endl; 
    return 0; 
}