安全验证 - 知乎:root{--zhc-padding-horizontal:20px;--zhc-padding-vertical:16px;--zhc-notification-top:75px;--app-padding:16px;--app-header-height:52px;--app-max-width:640px;--app-width:1000px;--app-font-size:15px;}.css-55n9hh{position:fixed;top:0;right:0;left:0;z-index:101;display:none;height:2px;pointer-events:none;background:#1772F6;-webkit-transform:translateX(-100%);-ms-transform:translateX(-100%);transform:translateX(-100%);}, The -p option is used to expose the ports that are used for the image instance. The first one is the hostport and the second parameter after the ":" fullcolon is the container port to which it should be mapped ., So pp [0] points to the address of p, which is 0x2000, and by dereferencing I would expect to get the contents of address 0x2000 That's were your reasoning strays, but understandably so. In C, the right hand side of an assignment, or generally an evaluation of an lvalue (vulgo: variable), more precisely an lvalue-to-rvalue conversion, is already a dereferencing! For example, int i, j=0; i=j .