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To call the function specified by a function pointer, just write the
function pointer value in a function call. For instance, here's a call
to the function binary_op points to:
binary_op (x, 5)Since the data type of binary_op explicitly specifies type double
for the arguments, the call converts x and 5 to double.
The call conceptually dereferences the pointer binary_op to "get" the
function it points to, and calls that function. If you wish, you can
explicitly represent the dereference by writing the * operator:
(*binary_op) (x, 5)The '*' reminds people reading the code that binary_op is a
function pointer rather than the name of a specific function.