Write a function int applyOp(int a, int b, int (*op)(int, int)) that calls the function pointed to by op with a and b and returns the result. A function int subtract(int a, int b) returning a - b is provided. In main, call applyOp(10, 4, subtract) and print the result:

6

The third parameter is a pointer to a function that takes two ints and returns an int.