swift 命名,字符串

命名：

let  numberOfDogs = 6 +2;

字符串连接： let finishedMessage = username + "xx" + password;

字符串打印值： let  food = "i like\(favoriteFood) because it is\(reason)"

p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #d12f1b }
span.s1 { color: #bb2ca2 }
span.s2 { color: #000000 }
span.s3 { }
span.s4 { color: #4f8187 }