main()xe5x87xbdxe6x95xb0xe9x87x8cxe9x9dxa2xe8xa2xabxe5xa4xa7xe6x8bxacxe5x8fxb7xe5xb0x81xe8xa3x85xe7x9ax84axe7x9ax84xe5x80xbcxe4xb8xbaxefxbcx9a1 fun()xe5x87xbdxe6x95xb0xe9x87x8cxe9x9dxa2xe7x9ax84axe5x80xbcxe4xb8xbaxefxbcx9a3 main() a value is 0 VSCode, 控制台, Mac
