Initial commit

test/grammer/function/01.dart

@@ -0,0 +1,20 @@
+void main() {
+  double toly = bmi(1.8, 70);
+  double ls = bmi(1.79, 65);
+  double wy = bmi(1.69, 50);
+
+  print("===toly:$toly===ls:$ls===wy:$wy===");
+}
+
+// void main() {
+//   double toly = 1.8 / (70 * 70);
+//   double ls = 1.79 / (65 * 65);
+//   double wy = 1.69 / (50 * 50);
+//   print("===toly:$toly===ls:$ls===wy:$wy===");
+// }
+
+double bmi(double height, double wight) {
+  // 具体算法
+  double result = wight / (height * height);
+  return result;
+}

test/grammer/function/02.dart

@@ -0,0 +1,23 @@
+void main() {
+  double toly = bmi(weight: 70, height: 1.8);
+  double ls = bmi(height: 1.79);
+  double wy = bmi(height: 1.69, weight: 50);
+
+  print("===toly:$toly===ls:$ls===wy:$wy===");
+}
+
+// void main() {
+//   double toly = 1.8 / (70 * 70);
+//   double ls = 1.79 / (65 * 65);
+//   double wy = 1.69 / (50 * 50);
+//   print("===toly:$toly===ls:$ls===wy:$wy===");
+// }
+
+double bmi({
+  required double height,
+  double weight = 65,
+}) {
+  // 具体算法
+  double result = weight / (height * height);
+  return result;
+}

test/grammer/function/03.dart

@@ -0,0 +1,20 @@
+void main() {
+  double toly = bmi(70, 1.8);
+  double ls = bmi();
+  double wy = bmi(1.69);
+
+  print("===toly:$toly===ls:$ls===wy:$wy===");
+}
+
+// void main() {
+//   double toly = 1.8 / (70 * 70);
+//   double ls = 1.79 / (65 * 65);
+//   double wy = 1.69 / (50 * 50);
+//   print("===toly:$toly===ls:$ls===wy:$wy===");
+// }
+
+double bmi([double height = 1.79, double weight = 65]) {
+  // 具体算法
+  double result = weight / (height * height);
+  return result;
+}