decltype keyword in C++

The decltype Keyword inspects the declared type of an entity or the type of an expression. ‘auto’ lets you declare a variable with a particular type whereas decltype lets you extract the type from the variable so decltype is sort of an operator that evaluates the type of passed expression. 
```
#include <bits/stdc++.h>
using namespace std;
 
int fun1() { return 10; }
char fun2() { return 'g'; }
 
int main()
{
    // Data type of x is same as return type of fun1()
    // and type of y is same as return type of fun2()
    decltype(fun1()) x;
    decltype(fun2()) y;
 
    cout << typeid(x).name() << endl;
    cout << typeid(y).name() << endl;
 
    return 0;
}
/*
i
c
*/
```
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