math.expf

[Konstantin8105]

Add test and implementation on Go for function math.h expf
Description: https://en.cppreference.com/w/c/numeric/math/exp
File for test code add : c4go/tests/math.c
Example see #155
Example of test, see

c4go/tests/math.c

Lines 218 to 230 in be1760b

	diag("exp");
	is_eq(exp(0), 1);
	is_eq(exp(1), 2.7182818284590450908);
	is_eq(exp(-1), 0.36787944117144233402);
	is_eq(exp(0.5), 1.6487212707001281942);
	// https://github.com/golang/go/issues/20539
	disabled(is_inf(exp(1.23e300), 1));
	is_eq(exp(-1.23e-300), 1);
	is_eq(exp(M_PI), 23.140692632779266802);
	is_eq(exp(M_E), 15.154262241479262485);
	is_inf(exp(INFINITY), 1);
	is_eq(exp(-INFINITY), 0);
	is_nan(exp(NAN));