请问为什么会显示 /tmp/compiler_siadzii8/src:3:11: 错误：‘::main’必须返回‘int’ void main()

#include<iostream>
using namespace std;
void main()
{
	cout << "                ********\n";
	cout << "               ************\n";
	cout << "               ####....#.\n";
	cout << "             #..###.....##....\n";
	cout << "             ###.......######              ###            ###\n";
	cout << "                ...........               #...#          #...#\n";
	cout << "               ##*#######                 #.#.#          #.#.#\n";
	cout << "            ####*******######             #.#.#          #.#.#\n";
	cout << "           ...#***.****.*###....          #...#          #...#\n";
	cout << "           ....**********##.....           ###            ###\n";
	cout << "           ....****    *****....\n";
	cout << "             ####        ####\n";
	cout << "           ######        ######\n";
	cout << "##############################################################\n";
	cout << "#...#......#.##...#......#.##...#......#.##------------------#\n";
	cout << "###########################################------------------#\n";
	cout << "#..#....#....##..#....#....##..#....#....#####################\n";
	cout << "##########################################    #----------#\n";
	cout << "#.....#......##.....#......##.....#......#    #----------#\n";
	cout << "##########################################    #----------#\n";
	cout << "#.#..#....#..##.#..#....#..##.#..#....#..#    #----------#\n";
	cout << "##########################################    ############\n";
};
```cpp