Sets the floating-point environment to a previously saved state
#include <fenv.h> int fesetenv ( const fenv_t *envp );
The fesetenv( ) function reinstates the floating-point environment from an object obtained by a prior call to fegetenv( ) or feholdexcept( ), or a macro such as FE_DFL_ENV, which is defined as a pointer to an object of type fenv_t representing the default floating-point environment. Although a call to fesetenv( ) may result in floating-point exception flags being set, the function does not raise the corresponding exceptions. The function returns 0 if successful; a nonzero return value indicates that an error occurred.
See the example for fegetenv( ) in this chapter.