what is demotion in c++?

Demotion:
Demotion occurs whenever a variable or expression of a larger type gets converted to
smaller type. Bye default, a floating point number is considered as a double number in C++.
int a=7.5 // double gets down – converted to int ;
int b=7.0f ; // float gets down – converted to int
char c=b ; // int gets down – converted to char
Standard Automatic demotion can result in the loss of information. In the first examp