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#include <iostream>
using namespace std;

int main() {
	int arr1[3][3];
	memset(arr1, 0, sizeof(arr1));
	for (int i = 0; i < 3; i++) {
		for (int j = 0; j < 3; j++) {
			cout << arr1[i][j] << " ";
		}
		cout << endl;
	}
	cout << endl;
	// 0 0 0
	// 0 0 0
	// 0 0 0
	return 0;
}

#include <iostream>
using namespace std;

int main() {
	char str[] = "Almost every programmer should know memset!";
	memset(str, '-', 6);
	puts(str); // ------ every programmer should know memset!
	return 0;
}

#include <iostream>
using namespace std;

int main() {
	int arr1[3][3];
	memset(arr1, 1, sizeof(arr1));
	for (int i = 0; i < 3; i++) {
		for (int j = 0; j < 3; j++) {
			cout << arr1[i][j] << " ";
		}
		cout << endl;
	}
	cout << endl;
	// 16843009 16843009 16843009 
	// 16843009 16843009 16843009 
	// 16843009 16843009 16843009
	return 0;
}