In C, tanh() returns the hyperbolic tangent of x. It is not an angle. tanh(0) is 0, and the result stays between -1 and 1.
You pass one double. The result is a double with the same sign as x. Include <math.h>.
Pass any real number. Start with this call.
tanh(0.0);| Call | What it does |
|---|---|
tanh(0.0) | Returns 0. |
Include <math.h>. On GCC, link with -lm. x is not an angle in degrees.
double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);| Parameter | Description |
|---|---|
| x | Required. Any real double. It is not an angle. |
| Return Value | Description |
|---|---|
| Hyperbolic tangent | A double between -1 and 1, with the same sign as x. |
Show tanh(0) and that the function is odd.
#include <math.h>
#include <stdio.h>
int main(void) {
printf("tanh(0) = %.4f\n", tanh(0.0));
printf("tanh(0.5) = %.4f\n", tanh(0.5));
printf("tanh(-0.5) = %.4f\n", tanh(-0.5));
return 0;
}tanh(0) is exactly 0.tanh(0.5) ≈ 0.4621.-lm.Big |x| pushes the result toward ±1, never past it.
#include <math.h>
#include <stdio.h>
int main(void) {
printf("tanh(1) = %.6f\n", tanh(1.0));
printf("tanh(5) = %.6f\n", tanh(5.0));
printf("tanh(-5) = %.6f\n", tanh(-5.0));
return 0;
}tanh(1) is about 0.76.tanh(5) is almost 1.−1.tan, output never escapes (−1, 1).sinh / coshConfirm tanh(x) matches sinh(x) / cosh(x).
#include <math.h>
#include <stdio.h>
int main(void) {
double x = 0.75;
double t = tanh(x);
double ratio = sinh(x) / cosh(x);
printf("tanh = %.6f\n", t);
printf("sinh/cosh = %.6f\n", ratio);
return 0;
}0.75—no unit conversion.0.635149.Learn how to chop the fractional part toward zero.
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