#include <jni.h>
#include <string>
#include <time.h>

extern "C" JNIEXPORT jstring JNICALL
Java_com_example_phi_myapplication6_MainActivity_stringFromJNI(
       JNIEnv *env,
       jobject /* this */) {

   std::string hello = "Hello from C++";
   return env->NewStringUTF(hello.c_str());

}
extern "C" JNIEXPORT jstring JNICALL
Java_com_example_phi_myapplication6_MainActivity_getStringRandom(
       JNIEnv *env,
jobject /* this */) {


   size_t length =10;
   auto randchar = []() -> char
   {
       const char charset[] =
               "0123456789"
               "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
               "abcdefghijklmnopqrstuvwxyz";
       const size_t max_index = (sizeof(charset) - 1);
       return charset[ rand() % max_index ];
   };
   std::string randomstr(length,0);
   std::generate_n( randomstr.begin(), length, randchar );

return env->NewStringUTF(randomstr.c_str());

}