Append 100 random integers to binary file with C++/Cpp programming

#include<iostream>
#include<fstream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main(){
	ofstream out("Exercise13_13.dat", (ios::out | ios::binary | ios_base::app));
	if(!out){
		cerr << "Error: failed to open file!" << endl;
		return 1;
	}
	srand(time(0));
	int num;
	int bytes = sizeof(int);
	const char *addr = reinterpret_cast<const char*>(&num);
	for(int i = 1; 100 >= i; i++){
		num = rand() % 100;
		out.write(addr, bytes);
	}
	out.close();
	return 0;
}

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