Scanf for double not working in Dev C++

Question

I am having problem with floating point numbers. I think something is clashing here.

The output is :

Answer 1

You are using the wrong format specifier in the scanf and doing this will result in UB(Undefined Behaviour).The correct format specifier for a double is %lf while that of a float is %f. So Just change your scanf to

scanf("%lf",&y);