what is malloc and calloc in c++ code example

Example 1: how to use malloc in c

int* a =(int*)malloc(sizeof(int))

Example 2: cpp malloc

int alloc_size = 10;
int* buffer = (int*) malloc (alloc_size);
//Allocate memory block which can fit 10 integers

Example 3: malloc c++ program

void* malloc(size_t size);