12.1 Write a program that declares and initializes two variables x and y to 10 and 20, respectively. Use two pointers to sum these values and print the result. 12.2 Write a program that declares three...

12.1 Write a program that declares and initializes two variables x and y to 10 and 20, respectively.

Use two pointers to sum these values and print the result.

12.2 Write a program that declares three pointers of type short *, int * and fl oat * pointing to

regular variables. Prove that the size of the pointer has no relation to the size of the variable

pointed to.