initializer list

Initializer List is used in initializing the data members of a class. The list of members to be initialized is indicated with constructor as a comma-separated list followed by a colon. 
We must use initializer list in a constructor when
*  There is a reference variable in class
*  There is a constant variable in class
* There is an object of another class. And the other class doesn’t have default constructor.
```
#include<iostream>
using namespace std;
 
class Test {
    const int t;
public:
    Test(int t):t(t) {}  //Initializer list must be used
};
 
int main() {
    Test t1(10);
    return 0;
}
```
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