constructor syntax in c 2b 2b

1BigMommaClass {
2    BigMommaClass(int, int);
3
4private:
5    ThingOne thingOne;
6    ThingTwo thingTwo;
7};
8
9BigMommaClass::BigMommaClass(int numba1, int numba2): thingOne(numba1 + numba2), thingTwo(numba1, numba2) {
10// Code here
11}

1
2struct Rectangle {
3    int width;  // member variable
4    int height; // member variable
5
6    // C++ constructors
7    Rectangle()
8    {
9        width = 1;
10        height = 1;
11    }
12
13    Rectangle( int width_  )
14    {
15        width = width_;
16        height = width_ ;
17    }
18
19    Rectangle( int width_ , int height_ )
20    {
21        width = width_;
22        height = height_;
23    }
24    // ...
25};
26
27

1class MyClass {     // The class
2  public:           // Access specifier
3    MyClass() {     // Constructor
4      cout << "Hello World!";
5    }
6};

1struct S {
2    int n;
3    S(int); // constructor declaration
4    S() : n(7) {} // constructor definition.
5                  // ": n(7)" is the initializer list
6                  // ": n(7) {}" is the function body
7};
8S::S(int x) : n{x} {} // constructor definition. ": n{x}" is the initializer list
9int main()
10{
11    S s; // calls S::S()
12    S s2(10); // calls S::S(int)
13}