Callback and function pointers

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>

int x = 3;  //global variable

int getNextRandomValue(void);
void populate_array(int *array, size_t arraySize, int (*getNextValue)(void));

int main()
{
    int c = 1;
    float a=3.1, b=3.5;
    int myarray[10];
//    populate_array(myarray, 10, getNextRandomValue);  //option
   populate_array(myarray, 10, &getNextRandomValue);
    printf(" myarray[2] is %d \n", myarray[2]);

    return 0;
}

int getNextRandomValue(void){
    return rand()%100;
}

//option
//void populate_array(int *array, size_t arraySize, int (*getNextValue)(void)){
void populate_array(int *array, size_t arraySize, int getNextValue(void)){
    for (size_t i=0; i<arraySize; i++)
        array[i] = getNextValue();
}