sin v/s sinf function in C

Question

I am trying to use the sinf function in my C Program but it gives me an undefined reference error under MSVC 6.0, however sin works fine.

T

Answer 1

sin takes a double and returns a double and is defined by ANSI C. sinf isn't.

Answer 2

sinf() was added to C in C99, which Microsoft Visual C++ does not fully support (even so, Visual C++ 6 was released before C99 was standardized).

You can use the sin() function, which takes a double (sinf() takes a float).

Answer 3

sin takes a double and returns a double - sinf takes a float and returns a float.

In other words sin is double precision and sinf is single precision.

If you're using an old compiler that doesn't have sinf you can implement it as:

#define sinf(x) (float)sin((double)(x))