Question

Why float f = 10d will cause the compiler error/ and why int and double did not cause any compiler error ?

public class Main {

    public static void main(String[] args) {
   // write your code here
        char c = 38;
        int i = 'a';
        double d = 10f;
        double d2 = 10;
        float f = 10d;
        System.out.println(a + b);
    }
}

Answer 1

Float (f) a 32 bit precision floating data type whereas double (d) is a 64 bit precision floating data type. In simpler terms, double can store a larger range of values as compared to float. Thus the statement float f = 10d will result in a compilation error as we are trying to convert a larger data type to a smaller data type.