You must #include <math.h> before you call any of
the standard
Turbo C math
functions. In general, Turbo C assumes that a function
that is not
declared returns an int. In the case of math functions,
they usually
return a double. For example
/* WRONG
*/ /* RIGHT */
#include
<math.h>
main() main()
{ {
printf("%f", cos(0)); printf("%f", cos(0));
} }