Question

编程为什么要用三角函数

Answer 1

math.h 和C一样调用。 程序： sin Summary #include float sin (float x); /* value to calculate sine for */ Description The sin function calculates the sine of the floating-point value x. The value of x must be in the -65535 to +65535 range or an NaN error value is generated. Return Value The sin function returns the sine of x. See Also cos, cos517, sin517, tan, tan517 Example #include #include /* for printf */ void tst_sin (void) { float x; float y; for (x = 0; x < (2 * 3.1415); x += 0.1) { y = sin (x); printf ("SIN(%f) = %f\n", x, y); } } 注：角度不是用度算的，以弧度为单位